feat: Add version tracking via pyproject.toml

- Add pyproject.toml as single source of truth for version and metadata
- Update config.py to read version from pyproject.toml using tomllib
- FastAPI app now loads title and version dynamically from config
- Health endpoint now includes version in response
- Dockerfile updated to include pyproject.toml

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

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

src/main.py

@@ -102,9 +102,10 @@ async def lifespan(app: FastAPI):
 
 
 # FastAPI app
+settings = get_settings()
 app = FastAPI(
-    title="The Scheduler",
-    version="1.0.0",
+    title=settings.app_name,
+    version=settings.app_version,
     description="System-wide maintenance orchestration - backups, doc mirroring, cleanup, task automation",
     lifespan=lifespan
 )
@@ -134,6 +135,7 @@ async def health(
     """Health check endpoint."""
     return {
         "status": "healthy",
+        "version": settings.app_version,
         "scheduler_running": sched.running,
         "jobs_count": len(sched.get_jobs()),
         "database": settings.postgres_db