Phase 3: HTMX & Alpine.js integration, router refactoring, and UI modernization

- Modernized the frontend with HTMX for server-driven UI and Alpine.js for client state.
- Refactored anime, player, and recommendation logic into modular routers.
- Updated README.md to reflect the latest project state and technologies (v2.4).
- Added Plyr.io for an improved streaming experience.
- Improved project structure with componentized templates.
- Added Playwright and Vitest configuration for frontend testing.

.gitignore

@@ -47,10 +47,24 @@ favorites.json
 ohm_streaming.db
 
 # Config (runtime-generated)
-config/anime_sama_domain.json
-config/metadata_cache.json
+config/*.json
+!config/*.example.json
 data/
 favorites.json
 *.db
 *.sqlite
 ohm_streaming.db
+
+# Node
+node_modules/
+package-lock.json.tmp
+playwright-report/
+test-results/
+
+# Agent/Tool specific
+.serena/
+.sisyphus/
+.claude/
+.opencode/
+.mypy_cache/
+.ruff_cache/