Restructure repo: move Go server into player-server/

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-# Player — Agent Documentation
-
-This file is written for coding agents working on the `player` project.
-
----
-
-## Architecture Overview
-
-The project is a **self-hosted media player** designed for simplicity (KISS): minimal dependencies, no frontend frameworks, interface-driven Go code for easy testing.
-
-### Backend
-
-- **Language / Runtime:** Go 1.23
-- **HTTP Server:** `net/http` stdlib only; `http.ServeMux` with pattern matching
-- **Database:** SQLite via `modernc.org/sqlite`
-- **Media Processing:** `ffmpeg` / `ffprobe` installed in runtime container
-- **Password Hashing:** `golang.org/x/crypto/bcrypt`
-
-**Layered architecture:**
-
-| Layer | Package | Role |
-|-------|---------|------|
-| Entrypoint | `cmd/player` | Flags, config, dependency wiring, server start |
-
-| `mage build` | Compile the binary (`go build -o player ./cmd/player`) |
-| `mage test` | Run `go test ./...` |
-| `mage install` | Build and copy `player` to `$GOPATH/bin` (or `~/go/bin`) |
-| `mage clean` | Remove the `player` binary |
-| `mage docker-build` | Build container image as `player:latest` |
-| `mage docker-push` | Push `player:latest` to registry |
-
----
-
-## Kubernetes Deployment
-
-The `k8s/` directory contains:
-
-| File | Resource |
-|------|----------|
-| `k8s/deployment.yaml` | `Deployment` (1 replica, non-root `65534:65534`, probes) |
-| `k8s/service.yaml` | `ClusterIP` Service on port 8080 |
-| `k8s/pvc-db.yaml` | `PersistentVolumeClaim` (`ReadWriteOnce`, 1Gi) for `/data` |
-| `k8s/pvc-media.yaml` | `PersistentVolumeClaim` (`ReadWriteMany`, 10Gi) for `/media` |
-| `k8s/secret.yaml` | `Secret` (optional) for environment overrides (e.g., `ADMIN_PASSWORD`) |
-
-Deploy everything:
-
-```bash
-kubectl apply -f k8s/
-```
-
-The `Deployment` overrides two critical settings for K8s:
-- `DB_PATH=/data/media.db`
-- `MEDIA_ROOT=/media`
-
-Probes:
-- **Liveness:** `GET /healthz` (no DB dependency)
-- **Readiness:** `GET /readyz` (DB ping)
-
-Security:
-- `runAsNonRoot: true`
-- `runAsUser: 65534` / `runAsGroup: 65534`
-- `allowPrivilegeEscalation: false`
-- `readOnlyRootFilesystem: true`
-
----
-
-## Theming Guide
-
-All colors live in `web/css/theme.css` as CSS Custom Properties on `:root`.
-
-### Current Implementation
-
-`themes.js` swaps the active theme by setting `document.documentElement.setAttribute('data-theme', ...)` and saves the preference to `localStorage`. Override blocks in `theme.css` handle the light variant:
-
-```css
-/* Default (dark) — defined on :root */
-:root {
-  --bg-body: #0f1117;
-  --text-primary: #e6e8ef;
-  --accent: #5e9eff;
-  ...
-}
-
-/* Light theme overrides */
-[data-theme="light"] {
-  --bg-body: #f4f5f8;
-  --text-primary: #12131a;
-  --accent: #2b6cb0;
-  ...
-}
-```
-
-### Adding a New Theme
-
-Option A — inline override (recommended for small additions):
-
-1. Open `web/css/theme.css`.
-2. Append a new attribute selector after the light block, e.g.:
-
-```css
-[data-theme="solarized"] {
-  --bg-body: #002b36;
-  --text-primary: #839496;
-  --accent: #268bd2;
-  ...
-}
-```
-
-3. Wire the toggle in `web/js/themes.js` (or expose a selector UI in `index.html`) to call `apply('solarized')`.
-
-Option B — separate file (if you prefer a stylesheet swap):
-
-1. Create `web/css/themes/<name>.css` containing `:root { ... }` overrides.
-2. Dynamically create or swap a `<link rel="stylesheet">` in `themes.js` instead of using `data-theme`.
-
-**Rules:**
-- No color literals in component styles — everything must go through `var(--*)`.
-- Do not add inline styles in HTML or JS.
-
----
-
-## Keyboard Shortcuts
-
-Global shortcuts are registered in `web/js/keyboard.js`. They are **disabled** while the user is focused on an `INPUT`, `TEXTAREA`, or `contentEditable` element (except `Escape` to blur).
-
-| Key | Action |
-|-----|--------|
-| `↑` / `↓` | Navigate media list (up / down) |
-| `k` / `j` | Navigate media list (up / down) |
-| `←` / `→` | Switch sets / pages |
-| `h` / `l` | Switch sets / pages |
-| `Enter` | Open selected media (navigate to detail) |
-| `Space` / `p` | Play / pause / switch to selected item |
-| `f` | Toggle fullscreen on the player wrapper |
-| `Esc` | Exit fullscreen, or deselect current item |
-| `r` | Enable shuffle, or reshuffle if shuffle is already active |
-| `s` | Generate a share link for the selected media |
-| `/` | Focus the quick search bar (debounced) |
-| `n` | Open notes modal for the selected media |
-
----
-
-## Admin Tasks
-
-Admin endpoints are gated by `RequireAdmin` middleware (checks `users.is_admin`). The admin panel is opened via the hidden "Admin" button in the SPA header (shown only when the current user is an admin).
-
-### Creating Users
-
-1. Open the admin panel.
-2. Enter username, password, and check "Is admin" if desired.
-3. Submit — the frontend calls `POST /api/admin/users`.
-4. Admins cannot delete themselves via `DELETE /api/admin/users/:id`.
-
-### Managing Set Permissions
-
-- `GET /api/admin/permissions` — list permissions matrix
-- `POST /api/admin/permissions` — grant access to a set (`body: { set_id, user_id, role: "owner" | "viewer" }`)
-- `DELETE /api/admin/permissions` — revoke access (`body: { set_id, user_id }`)
-
-Roles:
-- `owner` — can upload to the set, soft-delete / restore media, regenerate thumbnails
-- `viewer` — can browse and play media in the set
-
-Admins implicitly see all sets without explicit permission rows.
-
-### Rescanning the Library
-
-Click **Rescan** in the admin panel, or call:
-
-```bash
-curl -X POST -b session=<cookie> http://<host>/api/admin/rescan
-```
-
-This triggers `FSScanner.Scan()`, which:
-1. Scans immediate subdirectories of `MEDIA_ROOT` as **sets**
-2. Recursively walks each set for supported media files
-3. Probes new files with `ffprobe`
-4. Generates thumbnails for video files
-5. Inserts new records into the `media` table
-
----
-
-## Configuration via Environment Variables
-
-`internal/config.go` loads all settings from the environment.
-
-| Variable | Default | Validation | Description |
-|----------|---------|------------|-------------|
-| `PORT` | `8080` | 0–65535 | HTTP listen port (0 = ephemeral, used in tests) |
-| `MEDIA_ROOT` | `./media` | — | Root path for media set directories |
-| `DB_PATH` | `data.db` | — | SQLite database file path |
-| `MAX_UPLOAD_SIZE_MB` | `100` | ≥ 1 | Max upload size per file (MB) |
-| `SESSION_TIMEOUT_HOURS` | `24` | ≥ 1 | Cookie / session expiry |
-| `GC_INTERVAL_MINUTES` | `30` | ≥ 1 | Garbage collector tick interval |
-| `SHARE_DEFAULT_EXPIRY_DAYS` | `7` | ≥ 1 | Default share link lifetime |
-| `MEDIA_PAGE_SIZE` | `100` | ≥ 1 | Items displayed per thumbnail grid page |
-| `LOG_LEVEL` | `info` | `debug` / `info` / `warn` / `error` | Log verbosity |
-| `SECURE_COOKIES` | `true` | `true` / `false` | Set `Secure` flag on session cookies; set to `false` for plain-HTTP local deployments |
-
-**Important:** The K8s `Deployment` overrides `DB_PATH` to `/data/media.db` and `MEDIA_ROOT` to `/media` so the PVC mounts are used. Do not rely on the local defaults in a container.
-
----
-
-## Podcast Support
-
-Podcasts live under one shared **podcast set** (`sets.is_podcast = 1`, `root_path = "podcast"`). Each subscribed podcast is a `podcast_feeds` row and gets its own folder inside that single set.
-
-### Subscribing
-
-Admin opens the **Podcasts** button in the admin panel (or calls `POST /api/podcasts`):
-- Submit an RSS/Atom feed URL.
-- Server creates or reuses the shared `podcast` set, creates a feed folder inside it, parses the feed, downloads the cover image, and inserts episodes into `podcast_episodes`.
-
-### Episode Management
-
-Episodes are stored in `podcast_episodes` and rendered in the browse grid under the shared podcast set:
-- **Undownloaded** episodes show a **Download to server** button (calls `POST /api/podcasts/episodes/{id}/download`).
-- **Downloaded** episodes become regular `media` rows and appear as normal media cards.
-- Users can mark episodes as listened/unlistened via the checkmark button.
-
-### Background Feed Checker
-
-A background goroutine (`CheckFeeds`) refreshes feeds every hour (configurable via `PODCAST_CHECK_INTERVAL_MINUTES`). It uses conditional GET (`If-None-Match`, `If-Modified-Since`) to avoid re-downloading unchanged feeds.
-
-### New Endpoints
-
-| Method | Path | Description |
-|--------|------|-------------|
-| `GET` | `/api/podcasts` | List subscribed podcast feeds |
-| `POST` | `/api/podcasts` | Subscribe to a new feed (admin) |
-| `GET` | `/api/podcasts/{id}/episodes` | List episodes with status |
-| `POST` | `/api/podcasts/episodes/{id}/download` | Server-side download |
-| `POST` | `/api/podcasts/episodes/{id}/complete` | Toggle completion |
-
-### New Files
-
-- `internal/model/podcast.go` — PodcastFeed, PodcastEpisode, PodcastStatus
-- `internal/repository/podcast.go` — CRUD and queries
-- `internal/podcast/feed.go` — RSS/Atom parser using `gofeed`
-- `internal/podcast/cover.go` — Cover image downloader
-- `internal/service/podcast.go` — Business logic and background checker
-- `internal/api/handlers_podcast.go` — REST handlers
-- `internal/service/import.go` — Shared `ImportMediaFile` helper (used by uploads + downloader)
-- `web/js/podcasts.js` — Feed manager modal and episode renderer
-
----
-
-## Notes for Agents
-
-- When modifying tests, always run `go test ./... -race -cover` before committing.
-- Do not introduce package-level mutable state; inject via constructors.
-- All repository access goes through the `repository.Store` interface.
-- Frontend modules are plain ES modules — no transpilation step. Keep JS vanilla.
-- CSS changes must use `var(--*)` tokens from `theme.css`.
-- If you add new env vars, update both `internal/config.go` and this document.