Phase 1: auth, room CRUD, WebSocket chat, PWA frontend

Invite-only FastAPI + SQLAlchemy(async) + Postgres backend (session-cookie
auth via CLI-provisioned accounts, open-room CRUD, single-instance /ws/chat)
and a React + Vite PWA frontend (login, room list, chat view). Backend tests
pass against a local Postgres DB. See README.md and backend/README.md for
setup, and ARCHITECTURE.md for the full phased design.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/app/schemas/auth.py

@@ -0,0 +1,6 @@
+from pydantic import BaseModel, Field
+
+
+class LoginRequest(BaseModel):
+    username_or_email: str = Field(min_length=1)
+    password: str = Field(min_length=1)

backend/app/schemas/message.py

@@ -0,0 +1,14 @@
+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict
+
+
+class MessageRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    room_id: uuid.UUID
+    user_id: uuid.UUID
+    content: str
+    created_at: datetime

backend/app/schemas/room.py

@@ -0,0 +1,24 @@
+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class RoomCreate(BaseModel):
+    name: str = Field(min_length=1, max_length=100)
+    description: str | None = Field(default=None, max_length=2000)
+
+
+class RoomRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    name: str
+    description: str | None
+    is_private: bool
+    owner_id: uuid.UUID
+    created_at: datetime
+
+
+class RoomListItem(RoomRead):
+    is_member: bool

backend/app/schemas/user.py

@@ -0,0 +1,21 @@
+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, EmailStr, Field
+
+
+class UserCreate(BaseModel):
+    username: str = Field(min_length=3, max_length=50)
+    email: EmailStr
+    password: str = Field(min_length=8, max_length=200)
+
+
+class UserRead(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    username: str
+    email: EmailStr
+    is_bot: bool
+    is_site_admin: bool
+    created_at: datetime