Add .woodpecker/server.yml: Go server CI pipeline

Stage 1 (server-unit) runs go test -race -count=1 ./... on every push
for a fast ~10-15 s feedback gate. Stage 2 (server-integration +
web-smoke) runs only on pushes to main or PRs targeting main, after
Stage 1 passes. web-smoke builds the server binary, waits for /healthz
readiness via curl --retry, then runs the Playwright Chromium suite
against testmedia. Go module, build, and Playwright Chromium caches use
named Woodpecker host volumes to avoid redundant downloads.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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