Add admin-frontend and user-frontend standalone projects, certification/invoice/discovery features, fix auth header and theme consistency

backend/app/api/v1/invoice.py

@@ -0,0 +1,39 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+from pydantic import BaseModel
+from typing import Optional
+from app.database import get_db
+from app.api.v1.deps import get_current_user_id
+from app.services.invoice import InvoiceService
+
+router = APIRouter()
+
+
+class InvoiceApplyRequest(BaseModel):
+    invoice_type: str
+    title: str
+    tax_id: Optional[str] = None
+    amount: float
+
+
+@router.post("/apply")
+async def apply_invoice(
+    data: InvoiceApplyRequest,
+    user_id: str = Depends(get_current_user_id),
+    db: AsyncSession = Depends(get_db),
+):
+    service = InvoiceService(db)
+    result = await service.apply(user_id, data.model_dump())
+    if "error" in result:
+        raise HTTPException(status_code=400, detail=result["error"])
+    return {"success": True, "data": result}
+
+
+@router.get("/list")
+async def list_invoices(
+    user_id: str = Depends(get_current_user_id),
+    db: AsyncSession = Depends(get_db),
+):
+    service = InvoiceService(db)
+    items = await service.list_user(user_id)
+    return {"success": True, "data": items}