feat: scaffold v2 project structure with Docker, FastAPI, and config

동작하는 최소 코드 수준의 v2 스캐폴딩:

- docker-compose.yml: postgres, fastapi, kordoc, frontend, caddy
- app/: FastAPI 백엔드 (main, core, models, ai, prompts)
- services/kordoc/: Node.js 문서 파싱 마이크로서비스
- gpu-server/: AI Gateway + GPU docker-compose
- frontend/: SvelteKit 기본 구조
- migrations/: PostgreSQL 초기 스키마 (documents, tasks, processing_queue)
- tests/: pytest conftest 기본 설정
- config.yaml, Caddyfile, credentials.env.example 갱신

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

app/models/task.py

@@ -0,0 +1,29 @@
+"""tasks 테이블 ORM (CalDAV 캐시)"""
+
+from datetime import datetime
+
+from sqlalchemy import BigInteger, Boolean, DateTime, ForeignKey, SmallInteger, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from core.database import Base
+
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
+    caldav_uid: Mapped[str | None] = mapped_column(Text, unique=True)
+    title: Mapped[str] = mapped_column(Text, nullable=False)
+    description: Mapped[str | None] = mapped_column(Text)
+    due_date: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    priority: Mapped[int] = mapped_column(SmallInteger, default=0)
+    completed: Mapped[bool] = mapped_column(Boolean, default=False)
+    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    document_id: Mapped[int | None] = mapped_column(BigInteger, ForeignKey("documents.id"))
+    source: Mapped[str | None] = mapped_column(String(50))
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.now
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.now, onupdate=datetime.now
+    )