feat: complete leave approval MVP

ai-service/app/main.py

@@ -0,0 +1,57 @@
+from fastapi import Depends, FastAPI, HTTPException
+
+from app.config import get_settings
+from app.models import LeaveDraftSuggestionRequest, LeaveDraftSuggestionResponse, LeaveProgressAnswerRequest, LeaveProgressAnswerResponse
+from app.qwen import (
+    QwenConfigurationError,
+    QwenSuggestionGateway,
+    QwenUpstreamError,
+    SuggestionGateway,
+    ProgressGateway,
+)
+
+app = FastAPI(title="AIOA AI Service", version="0.1.0")
+
+
+def get_gateway() -> SuggestionGateway:
+    return QwenSuggestionGateway(get_settings())
+
+
+def get_progress_gateway() -> ProgressGateway:
+    return QwenSuggestionGateway(get_settings())
+
+
+@app.get("/health")
+async def health() -> dict[str, str]:
+    return {"status": "UP"}
+
+
+@app.post("/v1/leave-drafts/suggest", response_model=LeaveDraftSuggestionResponse)
+async def suggest_leave_draft(
+    request: LeaveDraftSuggestionRequest,
+    gateway: SuggestionGateway = Depends(get_gateway),
+) -> LeaveDraftSuggestionResponse:
+    try:
+        suggestion = await gateway.suggest(request)
+    except QwenConfigurationError as exc:
+        raise HTTPException(status_code=503, detail=str(exc)) from exc
+    except QwenUpstreamError as exc:
+        raise HTTPException(status_code=502, detail=str(exc)) from exc
+    return LeaveDraftSuggestionResponse(
+        suggestion=suggestion,
+        model=get_settings().qwen_model,
+    )
+
+
+@app.post("/v1/leave-progress/answer", response_model=LeaveProgressAnswerResponse)
+async def answer_leave_progress(
+    request: LeaveProgressAnswerRequest,
+    gateway: ProgressGateway = Depends(get_progress_gateway),
+) -> LeaveProgressAnswerResponse:
+    try:
+        answer = await gateway.answer_progress(request)
+    except QwenConfigurationError as exc:
+        raise HTTPException(status_code=503, detail=str(exc)) from exc
+    except QwenUpstreamError as exc:
+        raise HTTPException(status_code=502, detail=str(exc)) from exc
+    return LeaveProgressAnswerResponse(answer=answer, model=get_settings().qwen_model)