Initial commit: clean project structure

- Backend: FastAPI + SQLAlchemy + Celery (Python 3.11+)
- Frontend: Vue 3 + TypeScript + Pinia + Tailwind
- Admin Frontend: separate Vue 3 app for management
- Docker Compose: 9 services orchestration
- Specs: design prototypes, memory system PRD, product roadmap

Cleanup performed:
- Removed temporary debug scripts from backend root
- Removed deprecated admin_app.py (embedded UI)
- Removed duplicate docs from admin-frontend
- Updated .gitignore for Vite cache and egg-info

backend/app/db/admin_models.py

@@ -0,0 +1,119 @@
+from datetime import datetime
+from decimal import Decimal
+from uuid import uuid4
+
+from sqlalchemy import JSON, Boolean, DateTime, ForeignKey, Integer, Numeric, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.models import Base
+
+
+def _uuid() -> str:
+    return str(uuid4())
+
+
+class Provider(Base):
+    """Model provider registry."""
+
+    __tablename__ = "providers"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=_uuid)
+    name: Mapped[str] = mapped_column(String(100), nullable=False)
+    type: Mapped[str] = mapped_column(String(50), nullable=False)  # text/image/tts/storybook
+    adapter: Mapped[str] = mapped_column(String(100), nullable=False)
+    model: Mapped[str] = mapped_column(String(200), nullable=True)
+    api_base: Mapped[str] = mapped_column(String(300), nullable=True)
+    api_key: Mapped[str] = mapped_column(String(500), nullable=True)  # 可选，优先于 config_ref
+    timeout_ms: Mapped[int] = mapped_column(Integer, default=60000)
+    max_retries: Mapped[int] = mapped_column(Integer, default=1)
+    weight: Mapped[int] = mapped_column(Integer, default=1)
+    priority: Mapped[int] = mapped_column(Integer, default=0)
+    enabled: Mapped[bool] = mapped_column(Boolean, default=True)
+    config_json: Mapped[dict | None] = mapped_column(JSON, nullable=True)  # 存储额外配置(speed, vol, etc)
+    config_ref: Mapped[str] = mapped_column(String(100), nullable=True)  # 环境变量 key 名称（回退）
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.utcnow, onupdate=datetime.utcnow
+    )
+    updated_by: Mapped[str] = mapped_column(String(100), nullable=True)
+
+
+class ProviderMetrics(Base):
+    """供应商调用指标记录。"""
+
+    __tablename__ = "provider_metrics"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    provider_id: Mapped[str] = mapped_column(
+        String(36), ForeignKey("providers.id", ondelete="CASCADE"), nullable=False, index=True
+    )
+    timestamp: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.utcnow, index=True
+    )
+    success: Mapped[bool] = mapped_column(Boolean, nullable=False)
+    latency_ms: Mapped[int] = mapped_column(Integer, nullable=True)
+    cost_usd: Mapped[Decimal] = mapped_column(Numeric(10, 6), nullable=True)
+    error_message: Mapped[str] = mapped_column(Text, nullable=True)
+    request_id: Mapped[str] = mapped_column(String(100), nullable=True)
+
+
+class ProviderHealth(Base):
+    """供应商健康状态。"""
+
+    __tablename__ = "provider_health"
+
+    provider_id: Mapped[str] = mapped_column(
+        String(36), ForeignKey("providers.id", ondelete="CASCADE"), primary_key=True
+    )
+    is_healthy: Mapped[bool] = mapped_column(Boolean, default=True)
+    last_check: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=True)
+    consecutive_failures: Mapped[int] = mapped_column(Integer, default=0)
+    last_error: Mapped[str] = mapped_column(Text, nullable=True)
+
+
+class ProviderSecret(Base):
+    """供应商密钥加密存储。"""
+
+    __tablename__ = "provider_secrets"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=_uuid)
+    name: Mapped[str] = mapped_column(String(100), unique=True, nullable=False)
+    encrypted_value: Mapped[str] = mapped_column(Text, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.utcnow, onupdate=datetime.utcnow
+    )
+
+
+class CostRecord(Base):
+    """成本记录表 - 记录每次 API 调用的成本。"""
+
+    __tablename__ = "cost_records"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    user_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
+    provider_id: Mapped[str] = mapped_column(String(36), nullable=True)  # 可能是环境变量配置
+    provider_name: Mapped[str] = mapped_column(String(100), nullable=False)
+    capability: Mapped[str] = mapped_column(String(50), nullable=False)  # text/image/tts/storybook
+    estimated_cost: Mapped[Decimal] = mapped_column(Numeric(10, 6), nullable=False)
+    timestamp: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.utcnow, index=True
+    )
+
+
+class UserBudget(Base):
+    """用户预算配置。"""
+
+    __tablename__ = "user_budgets"
+
+    user_id: Mapped[str] = mapped_column(String(36), primary_key=True)
+    daily_limit_usd: Mapped[Decimal] = mapped_column(Numeric(10, 4), default=Decimal("1.0"))
+    monthly_limit_usd: Mapped[Decimal] = mapped_column(Numeric(10, 4), default=Decimal("10.0"))
+    alert_threshold: Mapped[Decimal] = mapped_column(
+        Numeric(3, 2), default=Decimal("0.8")
+    )  # 80% 时告警
+    enabled: Mapped[bool] = mapped_column(Boolean, default=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.utcnow, onupdate=datetime.utcnow
+    )