feat: Meeting Assistant MVP - Complete implementation

Enterprise Meeting Knowledge Management System with:

Backend (FastAPI):
- Authentication proxy with JWT (pj-auth-api integration)
- MySQL database with 4 tables (users, meetings, conclusions, actions)
- Meeting CRUD with system code generation (C-YYYYMMDD-XX, A-YYYYMMDD-XX)
- Dify LLM integration for AI summarization
- Excel export with openpyxl
- 20 unit tests (all passing)

Client (Electron):
- Login page with company auth
- Meeting list with create/delete
- Meeting detail with real-time transcription
- Editable transcript textarea (single block, easy editing)
- AI summarization with conclusions/action items
- 5-second segment recording (efficient for long meetings)

Sidecar (Python):
- faster-whisper medium model with int8 quantization
- ONNX Runtime VAD (lightweight, ~20MB vs PyTorch ~2GB)
- Chinese punctuation processing
- OpenCC for Traditional Chinese conversion
- Anti-hallucination parameters
- Auto-cleanup of temp audio files

OpenSpec:
- add-meeting-assistant-mvp (47 tasks, archived)
- add-realtime-transcription (29 tasks, archived)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/models/__init__.py

@@ -0,0 +1,37 @@
+from .schemas import (
+    LoginRequest,
+    LoginResponse,
+    TokenPayload,
+    MeetingCreate,
+    MeetingUpdate,
+    MeetingResponse,
+    MeetingListResponse,
+    ConclusionCreate,
+    ConclusionResponse,
+    ActionItemCreate,
+    ActionItemUpdate,
+    ActionItemResponse,
+    SummarizeRequest,
+    SummarizeResponse,
+    ActionItemStatus,
+    UserRole,
+)
+
+__all__ = [
+    "LoginRequest",
+    "LoginResponse",
+    "TokenPayload",
+    "MeetingCreate",
+    "MeetingUpdate",
+    "MeetingResponse",
+    "MeetingListResponse",
+    "ConclusionCreate",
+    "ConclusionResponse",
+    "ActionItemCreate",
+    "ActionItemUpdate",
+    "ActionItemResponse",
+    "SummarizeRequest",
+    "SummarizeResponse",
+    "ActionItemStatus",
+    "UserRole",
+]

backend/app/models/schemas.py

@@ -0,0 +1,128 @@
+from pydantic import BaseModel
+from typing import Optional, List
+from datetime import datetime, date
+from enum import Enum
+
+
+class ActionItemStatus(str, Enum):
+    OPEN = "Open"
+    IN_PROGRESS = "In Progress"
+    DONE = "Done"
+    DELAYED = "Delayed"
+
+
+class UserRole(str, Enum):
+    ADMIN = "admin"
+    USER = "user"
+
+
+# Auth schemas
+class LoginRequest(BaseModel):
+    email: str
+    password: str
+
+
+class LoginResponse(BaseModel):
+    token: str
+    email: str
+    role: str
+
+
+class TokenPayload(BaseModel):
+    email: str
+    role: str
+    exp: Optional[int] = None
+
+
+# Meeting schemas
+class ConclusionCreate(BaseModel):
+    content: str
+
+
+class ConclusionResponse(BaseModel):
+    conclusion_id: int
+    meeting_id: int
+    content: str
+    system_code: Optional[str] = None
+
+
+class ActionItemCreate(BaseModel):
+    content: str
+    owner: Optional[str] = ""
+    due_date: Optional[date] = None
+
+
+class ActionItemUpdate(BaseModel):
+    content: Optional[str] = None
+    owner: Optional[str] = None
+    due_date: Optional[date] = None
+    status: Optional[ActionItemStatus] = None
+
+
+class ActionItemResponse(BaseModel):
+    action_id: int
+    meeting_id: int
+    content: str
+    owner: Optional[str] = None
+    due_date: Optional[date] = None
+    status: ActionItemStatus
+    system_code: Optional[str] = None
+
+
+class MeetingCreate(BaseModel):
+    subject: str
+    meeting_time: datetime
+    location: Optional[str] = ""
+    chairperson: Optional[str] = ""
+    recorder: Optional[str] = ""
+    attendees: Optional[str] = ""
+    transcript_blob: Optional[str] = ""
+    conclusions: Optional[List[ConclusionCreate]] = []
+    actions: Optional[List[ActionItemCreate]] = []
+
+
+class MeetingUpdate(BaseModel):
+    subject: Optional[str] = None
+    meeting_time: Optional[datetime] = None
+    location: Optional[str] = None
+    chairperson: Optional[str] = None
+    recorder: Optional[str] = None
+    attendees: Optional[str] = None
+    transcript_blob: Optional[str] = None
+    conclusions: Optional[List[ConclusionCreate]] = None
+    actions: Optional[List[ActionItemCreate]] = None
+
+
+class MeetingResponse(BaseModel):
+    meeting_id: int
+    uuid: str
+    subject: str
+    meeting_time: datetime
+    location: Optional[str] = None
+    chairperson: Optional[str] = None
+    recorder: Optional[str] = None
+    attendees: Optional[str] = None
+    transcript_blob: Optional[str] = None
+    created_by: Optional[str] = None
+    created_at: datetime
+    conclusions: List[ConclusionResponse] = []
+    actions: List[ActionItemResponse] = []
+
+
+class MeetingListResponse(BaseModel):
+    meeting_id: int
+    uuid: str
+    subject: str
+    meeting_time: datetime
+    chairperson: Optional[str] = None
+    created_at: datetime
+
+
+# AI schemas
+class SummarizeRequest(BaseModel):
+    transcript: str
+
+
+class SummarizeResponse(BaseModel):
+    conclusions: List[str]
+    action_items: List[ActionItemCreate]