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/schemas/schedule_type.py

@@ -0,0 +1,36 @@
+"""Schemas for ScheduleType CRUD."""
+
+from pydantic import BaseModel, Field
+from typing import Optional
+
+
+class ScheduleTypeCreate(BaseModel):
+    name: str = Field(..., min_length=1, max_length=64)
+    work_from: int = Field(..., ge=0, le=23)
+    work_to: int = Field(..., ge=0, le=23)
+    entertainment_from: int = Field(..., ge=0, le=23)
+    entertainment_to: int = Field(..., ge=0, le=23)
+
+
+class ScheduleTypeUpdate(BaseModel):
+    name: Optional[str] = Field(None, min_length=1, max_length=64)
+    work_from: Optional[int] = Field(None, ge=0, le=23)
+    work_to: Optional[int] = Field(None, ge=0, le=23)
+    entertainment_from: Optional[int] = Field(None, ge=0, le=23)
+    entertainment_to: Optional[int] = Field(None, ge=0, le=23)
+
+
+class ScheduleTypeResponse(BaseModel):
+    id: int
+    name: str
+    work_from: int
+    work_to: int
+    entertainment_from: int
+    entertainment_to: int
+
+    class Config:
+        from_attributes = True
+
+
+class AgentScheduleTypeAssign(BaseModel):
+    schedule_type_name: str = Field(..., description="Name of the schedule type to assign")