feat(CG5): add /billing/by-service endpoint

agents/core-logic/app.py

@@ -2,6 +2,7 @@
 # OSVauco-NMTMD-GCOS — FastAPI HTTP entrypoint for Cloud Run
 
 import os
+import sys
 import logging
 from contextlib import asynccontextmanager
 
@@ -12,6 +13,9 @@ from pydantic import BaseModel
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
+# Allow imports from repo root (e.g. ml.billing_agent)
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
+
 try:
     from google.adk.runners import Runner
     from google.adk.sessions import InMemorySessionService
@@ -167,10 +171,11 @@ async def billing_tokens_summary():
         logger.error(f"[/billing/tokens/summary] Failed: {e}", exc_info=True)
         raise HTTPException(status_code=500, detail=str(e))
 
+
 @app.get("/billing/recommendations")
 async def billing_recommendations(budget: float = 500.0):
     """
-    CG4 — Kjører anbefalings- og anomali-motoren.
+    CG4 — Kjorer anbefalings- og anomali-motoren.
     Returnerer en liste med anbefalinger og estimert besparelse.
     """
     try:
@@ -179,3 +184,18 @@ async def billing_recommendations(budget: float = 500.0):
     except Exception as e:
         logger.error(f"[/billing/recommendations] Failed: {e}", exc_info=True)
         raise HTTPException(status_code=500, detail=str(e))
+
+
+@app.get("/billing/by-service")
+async def billing_by_service(days: int = 30):
+    """
+    CG5 — Returnerer kostnad per tjeneste gruppert med SKU-detaljer.
+    Brukes av dashboard for grouped drill-down visning.
+    """
+    try:
+        from ml.billing_agent import BillingAgent
+        agent = BillingAgent()
+        return JSONResponse(agent.get_service_totals(days))
+    except Exception as e:
+        logger.error(f"[/billing/by-service] Failed: {e}", exc_info=True)
+        raise HTTPException(status_code=500, detail=str(e))