Initial commit: SenSu Alpha 0.2.0

- 13-service async plugin framework
- Textual TUI with CLI fallback
- Plugin hot-reload + permission system
- Web management panel (aiohttp)
- Bridge-based inter-module communication
- 10 regression tests

Fixes applied:
- PBKDF2-SHA256 auth (was plain SHA256)
- Auth bypass removed (was allow-all on fail)
- Bare excepts replaced with logged errors
- CatFramework/DreamSu -> SenSu naming unified
- ServiceManager: health checks + startup_order
- Env var credentials (SENSU_ADMIN_PASSWORD etc)

requirements.txt

@@ -0,0 +1,8 @@
+rich>=13.0.0
+textual>=0.40.0
+websockets>=12.0
+aiohttp>=3.9.0
+pyyaml>=6.0
+watchdog>=3.0.0
+asyncio-mqtt>=0.16.0
+psutil>=5.9.0