feat: 算力补贴体系 - usage_records加成本字段+补贴发放接口

- compute_usage_records加4字段(cost_amount/gross_profit/model_cost_ratio/subsidy_eligible)
- 新增alembic迁移0080
- compute_internal新增subsidy-grant接口(增加用户算力余额)
- deduct_by_engine_cost透传成本/毛利字段并保存

app/api/routers/compute_internal.py

@@ -28,6 +28,9 @@ class EngineDeductRequest(BaseModel):
     engine_log_id: int
     model_name: str = ""
     token_count: int = 0
+    cost_micro: int = 0           # 采购成本（微元），补贴体系数据底座
+    model_cost_ratio: float = 1.0  # 模型成本比例快照
+    subsidy_eligible: int = 1     # 是否参与补贴
 
 
 def _verify_internal_token(authorization: str = Header(default="")) -> None:
@@ -38,6 +41,40 @@ def _verify_internal_token(authorization: str = Header(default="")) -> None:
         raise HTTPException(status_code=401, detail="invalid internal token")
 
 
+class SubsidyGrantRequest(BaseModel):
+    username: str
+    amount_micro: int
+    period: str = ""
+    record_id: int = 0
+
+
+@router.post("/subsidy-grant", summary="compute 补贴发放（增加用户算力余额）")
+async def subsidy_grant(
+    req: SubsidyGrantRequest,
+    db: Database = Depends(get_db),
+    _auth: None = Depends(_verify_internal_token),
+):
+    """补贴发放：amount_micro（微元）→ 增加用户个人算力余额 + 记录审计。"""
+    if req.amount_micro <= 0:
+        return {"ok": True, "amount": 0, "reason": "zero_amount"}
+    amount_fen = max(0, int(req.amount_micro) // 10000)  # 微元→分
+    if amount_fen <= 0:
+        return {"ok": True, "amount": 0, "reason": "zero_fen"}
+
+    user = await db.users.get_by_username(req.username)
+    if not user:
+        return {"ok": False, "amount": 0, "reason": "user_not_found"}
+    user_id = user["id"]
+
+    # 增加个人算力余额
+    from ...services.compute_pricing_service import adjust_user_quota
+    await adjust_user_quota(db, user_id, amount_fen, reason=f"subsidy_grant period={req.period} record_id={req.record_id}")
+
+    logger.info("[compute-internal] subsidy granted username=%s amount_fen=%s period=%s record_id=%s",
+                req.username, amount_fen, req.period, req.record_id)
+    return {"ok": True, "amount": amount_fen, "username": req.username, "period": req.period}
+
+
 @router.post("/deduct", summary="compute 引擎扣费回调（按实际费用扣平台账本）")
 async def engine_deduct(
     req: EngineDeductRequest,
@@ -53,6 +90,9 @@ async def engine_deduct(
             engine_log_id=req.engine_log_id,
             model_name=req.model_name,
             token_count=req.token_count,
+            cost_micro=req.cost_micro,
+            model_cost_ratio=req.model_cost_ratio,
+            subsidy_eligible=req.subsidy_eligible,
         )
         return {"ok": result.get("ok", True), **result}
     except Exception as exc:  # noqa: BLE001