Consolidate into single prometheus-pusher binary

Unified all functionality into one binary instead of multiple variants.

## Changes

- Removed: prometheus-pusher-auto, prometheus-pusher-historic
- Single binary: prometheus-pusher (supports all modes)
- Updated all documentation to reference single binary
- Updated run.sh to use unified binary

## Usage

One binary, four modes:

```bash
# Realtime mode (default)
./prometheus-pusher -mode=realtime -continuous

# Historic mode (single datapoint)
./prometheus-pusher -mode=historic -hours-ago=24

# Backfill mode (range of datapoints)
./prometheus-pusher -mode=backfill -start-hours=48 -end-hours=0 -interval=1

# Auto mode (automatic timestamp detection)
./prometheus-pusher -mode=auto -file=data.csv
```

All features accessible from one unified tool!

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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