feat: add project creation permission (admin only), add milestones API with RBAC

app/main.py

@@ -35,6 +35,7 @@ from app.api.routers.comments import router as comments_router
 from app.api.routers.webhooks import router as webhooks_router
 from app.api.routers.misc import router as misc_router
 from app.api.routers.monitor import router as monitor_router
+from app.api.routers.milestones import router as milestones_router
 
 app.include_router(auth_router)
 app.include_router(issues_router)
@@ -44,6 +45,7 @@ app.include_router(comments_router)
 app.include_router(webhooks_router)
 app.include_router(misc_router)
 app.include_router(monitor_router)
+app.include_router(milestones_router)
 
 
 # Auto schema migration for lightweight deployments