Add FastAPI endpoint and catalog loader

app/main.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+import os
+from pathlib import Path
+
+from fastapi import FastAPI
+
+from app.catalog import load_raw_catalog
+from app.models import MatchRequest, MatchResponse, MatchResult
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+CATALOG_PATH = Path(os.environ.get("CATALOG_PATH", BASE_DIR / "catalog_excel.csv"))
+RAW_CATALOG = load_raw_catalog(CATALOG_PATH)
+
+app = FastAPI(title="Offline catalog matcher", version="0.1.0")
+
+
+@app.get("/health")
+def health() -> dict[str, object]:
+    return {"status": "ok", "catalog_items": len(RAW_CATALOG)}
+
+
+@app.post("/match", response_model=MatchResponse)
+def match(request: MatchRequest) -> MatchResponse:
+    return MatchResponse(
+        results=[
+            MatchResult(message=message, status="not_found", candidates=[])
+            for message in request.messages
+        ]
+    )