feat: schedule type system for work/entertainment periods

- New model: ScheduleType (name, work_from/to, entertainment_from/to)
- Agent.schedule_type_id FK to schedule_types
- CRUD API: GET/POST/PATCH/DELETE /schedule-types/
- Agent assignment: PUT /schedule-types/agent/{agent_id}/assign
- Agent self-query: GET /schedule-types/agent/me
- Permissions: schedule_type.read, schedule_type.manage
- Migration: adds schedule_type_id column to agents table

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/main.py

@@ -63,6 +63,7 @@ from app.api.routers.proposes import router as proposes_router  # legacy compat
 from app.api.routers.milestone_actions import router as milestone_actions_router
 from app.api.routers.meetings import router as meetings_router
 from app.api.routers.essentials import router as essentials_router
+from app.api.routers.schedule_type import router as schedule_type_router
 from app.api.routers.calendar import router as calendar_router
 
 app.include_router(auth_router)
@@ -80,6 +81,7 @@ app.include_router(proposes_router)  # legacy compat
 app.include_router(milestone_actions_router)
 app.include_router(meetings_router)
 app.include_router(essentials_router)
+app.include_router(schedule_type_router)
 app.include_router(calendar_router)
 
 
@@ -363,6 +365,10 @@ def _migrate_schema():
         if _has_table(db, "time_slots") and not _has_column(db, "time_slots", "wakeup_sent_at"):
             db.execute(text("ALTER TABLE time_slots ADD COLUMN wakeup_sent_at DATETIME NULL"))
 
+        # --- agents: add schedule_type_id FK ---
+        if _has_table(db, "agents") and not _has_column(db, "agents", "schedule_type_id"):
+            db.execute(text("ALTER TABLE agents ADD COLUMN schedule_type_id INTEGER NULL"))
+
         db.commit()
     except Exception as e:
         db.rollback()
@@ -397,7 +403,7 @@ def _sync_default_user_roles(db):
 @app.on_event("startup")
 def startup():
     from app.core.config import Base, engine, SessionLocal
-    from app.models import models, webhook, apikey, activity, milestone, notification, worklog, monitor, role_permission, task, support, meeting, proposal, propose, essential, agent, calendar, minimum_workload
+    from app.models import models, webhook, apikey, activity, milestone, notification, worklog, monitor, role_permission, task, support, meeting, proposal, propose, essential, agent, calendar, minimum_workload, schedule_type
     Base.metadata.create_all(bind=engine)
     _migrate_schema()