[rybbit] Remove ollama favicon cache entry (deploy on next manual wrangler)

## Context
Stage 6 of ollama decommission. The Cloudflare Worker at
stacks/rybbit/worker/index.js maps hostnames → rybbit analytics site IDs.
With `ollama.viktorbarzin.me` going away, the mapping is dead.

## This change
- Removes the `"ollama.viktorbarzin.me": "e73bebea399f"` entry from SITE_IDS.
- **Source-only** — does NOT auto-deploy. Cloudflare Workers are deployed
  via `wrangler deploy` (manual, per user preference). The change will take
  effect on the next manual deploy at the user's convenience.

## Manual deploy (when convenient)
```
cd stacks/rybbit/worker
wrangler deploy
```

## Test plan
### Automated
- Node syntax check: file remains valid JS (trailing comma rules preserved).

### Manual Verification
After `wrangler deploy`:
1. Hit `ollama.viktorbarzin.me` (while it still exists) — should NOT inject
   rybbit script (map lookup misses, DEFAULT_SITE_ID is null).
2. Hit any other mapped host (e.g. `immich.viktorbarzin.me`) — should
   continue to inject correctly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

stacks/rybbit/worker/index.js

@@ -24,7 +24,6 @@ const SITE_IDS = {
   "navidrome.viktorbarzin.me": "8a3844ff75ba",
   "networking-toolbox.viktorbarzin.me": "50e38577e41c",
   "nextcloud.viktorbarzin.me": "5a3bfe59a3fe",
-  "ollama.viktorbarzin.me": "e73bebea399f",
   "paperless-ngx.viktorbarzin.me": "be6d140cbed8",
   "privatebin.viktorbarzin.me": "3ae810b0476d",
   "wrongmove.viktorbarzin.me": "edee05de453d",