refactor: extract pydantic schemas from routers into schemas/ directory (Task 3.2)

- Create schemas/ directory with 12 schema files covering all domains
- Extract 70+ Pydantic models from 11 router files
- Routers now import from src.schemas.{domain} instead of defining inline
- Zero inline BaseModel definitions remain in any router

Quality gates: py_compile all schemas (pass), py_compile all routers (pass)
Refs: repo-restructure Task 3.2

apps/api/src/api/config_folders.py

@@ -4,6 +4,7 @@ import logging
 import uuid
 
 from fastapi import APIRouter, Depends, HTTPException, status
+from pydantic import Field
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 

apps/api/src/api/health.py

@@ -5,11 +5,17 @@ from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, status
-from pydantic import BaseModel, Field
 from sqlalchemy import text
 
 from src.config import Settings
 from src.database import SessionLocal
+from src.schemas.health import (
+    DatabaseHealth,
+    DatabaseHealthResponse,
+    DiskHealth,
+    HealthChecks,
+    HealthResponse,
+)
 
 router = APIRouter()
 
@@ -17,45 +23,6 @@ router = APIRouter()
 _start_time = time.time()
 
 
-class DatabaseHealth(BaseModel):
-    """Database health check result."""
-
-    status: str = Field(description="Database health status", examples=["healthy"])
-    response_time_ms: float = Field(description="Query response time in milliseconds", examples=[5.2])
-
-
-class DiskHealth(BaseModel):
-    """Disk space health check result."""
-
-    status: str = Field(description="Disk health status", examples=["healthy"])
-    free_gb: float = Field(description="Free disk space in GB", examples=[45.2])
-    total_gb: float = Field(description="Total disk space in GB", examples=[100.0])
-
-
-class HealthChecks(BaseModel):
-    """Individual health checks."""
-
-    database: DatabaseHealth | None = None
-    disk: DiskHealth | None = None
-
-
-class HealthResponse(BaseModel):
-    """Overall health check response."""
-
-    status: str = Field(description="Overall health status", examples=["healthy"])
-    timestamp: str = Field(description="ISO 8601 timestamp", examples=["2026-05-19T12:00:00Z"])
-    version: str = Field(description="API version", examples=["0.1.0"])
-    checks: HealthChecks = Field(description="Individual health checks")
-    uptime_seconds: float = Field(description="Server uptime in seconds", examples=[3600.0])
-
-
-class DatabaseHealthResponse(BaseModel):
-    """Database-specific health check response."""
-
-    status: str = Field(description="Database health status", examples=["healthy"])
-    response_time_ms: float = Field(description="Query response time in milliseconds", examples=[5.2])
-
-
 @router.get(
     "/health",
     response_model=HealthResponse,

apps/api/src/api/user_config.py

@@ -2,15 +2,13 @@ import logging
 import uuid
 
 from fastapi import APIRouter, Depends, HTTPException, status
-
-logger = logging.getLogger(__name__)
-from pydantic import BaseModel, ConfigDict
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from src.auth.dependencies import get_current_user, get_db_session
 from src.models.user import User
 from src.models.user_config import UserConfig
+from src.schemas.user_config import UserConfigResponse, UserConfigUpdate
 
 router = APIRouter(prefix="/users/me", tags=["user-config"])
 
@@ -36,24 +34,6 @@ async def _get_or_create_config(session: AsyncSession, user_id: uuid.UUID) -> Us
     return config
 
 
-class UserConfigResponse(BaseModel):
-    model_config = ConfigDict(from_attributes=True)
-
-    default_editor: str | None = None
-    theme: str = "system"
-    git_user_name: str | None = None
-    git_user_email: str | None = None
-    last_session_id: str | None = None
-
-
-class UserConfigUpdate(BaseModel):
-    default_editor: str | None = None
-    theme: str | None = None
-    git_user_name: str | None = None
-    git_user_email: str | None = None
-    last_session_id: str | None = None
-
-
 @router.get(
     "/config",
     response_model=UserConfigResponse,

apps/api/src/api/users.py

@@ -2,11 +2,11 @@ import uuid
 from pathlib import Path
 
 from fastapi import APIRouter, Depends, HTTPException, UploadFile, status
-from pydantic import BaseModel, ConfigDict
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from src.auth.dependencies import get_current_user, get_db_session
 from src.models.user import User
+from src.schemas.user import UserProfileResponse, UserProfileUpdate
 
 router = APIRouter(prefix="/users", tags=["users"])
 
@@ -17,20 +17,6 @@ MAX_AVATAR_SIZE = 2 * 1024 * 1024  # 2MB
 
 
 
-class UserProfileResponse(BaseModel):
-    model_config = ConfigDict(from_attributes=True)
-
-    id: uuid.UUID
-    email: str
-    name: str
-    avatar_url: str | None
-
-
-class UserProfileUpdate(BaseModel):
-    name: str | None = None
-    email: str | None = None
-
-
 @router.get(
     "/me",
     response_model=UserProfileResponse,

apps/api/src/schemas/health.py

@@ -0,0 +1,50 @@
+"""Health check response schemas."""
+
+from pydantic import BaseModel, Field
+
+
+class DatabaseHealth(BaseModel):
+    """Database health check result."""
+
+    status: str = Field(description="Database health status", examples=["healthy"])
+    response_time_ms: float = Field(
+        description="Query response time in milliseconds", examples=[5.2]
+    )
+
+
+class DiskHealth(BaseModel):
+    """Disk space health check result."""
+
+    status: str = Field(description="Disk health status", examples=["healthy"])
+    free_gb: float = Field(description="Free disk space in GB", examples=[45.2])
+    total_gb: float = Field(description="Total disk space in GB", examples=[100.0])
+
+
+class HealthChecks(BaseModel):
+    """Individual health checks."""
+
+    database: DatabaseHealth | None = None
+    disk: DiskHealth | None = None
+
+
+class HealthResponse(BaseModel):
+    """Overall health check response."""
+
+    status: str = Field(description="Overall health status", examples=["healthy"])
+    timestamp: str = Field(
+        description="ISO 8601 timestamp", examples=["2026-05-19T12:00:00Z"]
+    )
+    version: str = Field(description="API version", examples=["0.1.0"])
+    checks: HealthChecks = Field(description="Individual health checks")
+    uptime_seconds: float = Field(
+        description="Server uptime in seconds", examples=[3600.0]
+    )
+
+
+class DatabaseHealthResponse(BaseModel):
+    """Database-specific health check response."""
+
+    status: str = Field(description="Database health status", examples=["healthy"])
+    response_time_ms: float = Field(
+        description="Query response time in milliseconds", examples=[5.2]
+    )

apps/api/src/schemas/user.py

@@ -0,0 +1,19 @@
+"""User request/response schemas."""
+
+import uuid
+
+from pydantic import BaseModel, ConfigDict
+
+
+class UserProfileResponse(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    email: str
+    name: str
+    avatar_url: str | None
+
+
+class UserProfileUpdate(BaseModel):
+    name: str | None = None
+    email: str | None = None

apps/api/src/schemas/user_config.py

@@ -0,0 +1,21 @@
+"""User config request/response schemas."""
+
+from pydantic import BaseModel, ConfigDict
+
+
+class UserConfigResponse(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    default_editor: str | None = None
+    theme: str = "system"
+    git_user_name: str | None = None
+    git_user_email: str | None = None
+    last_session_id: str | None = None
+
+
+class UserConfigUpdate(BaseModel):
+    default_editor: str | None = None
+    theme: str | None = None
+    git_user_name: str | None = None
+    git_user_email: str | None = None
+    last_session_id: str | None = None