Update documentation for app info pages feature

- CONTEXT.md: session 5 with app detail/info pages + optional config
- README.md: add optional-config API endpoint, update version to 0.2.11
- CLAUDE.md: add app info page patterns to key patterns section

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

CLAUDE.md

@@ -171,6 +171,10 @@ manually via the dashboard "Sablonok frissítése" button.
 - Memory bar on deploy page uses two-segment stacked bar (committed = solid green, new = translucent green)
 - Deploy flow shows 3-step progress panel (config → containers → health), polls `GET /api/stacks/{name}` every 3s until running/unhealthy/timeout(120s)
 - Telepítés buttons have `checkBeforeDeploy()` onclick guard — fetches live state from API before navigating to deploy page
+- App info pages at `/apps/{slug}` — detail view with use cases, setup guide, screenshots, optional config
+- Optional config saves to `app.yaml` and restarts deployed apps via `docker compose up -d`
+- `optional_config` fields in `.felhom.yml` define post-deploy configurable env vars (e.g., API keys)
+- `app_info` in `.felhom.yml` provides tagline, use_cases, first_steps, prerequisites, default_creds, docs_url
 
 ## Git sync module (internal/sync)