fix(ci): Resolve Python and TypeScript lint errors

- Fix 35 Python ruff errors (B904, F841, E722, E741, B007, B008)
- Add eslint config for lewooogo-core package
- Update pyproject.toml to new ruff lint config format
- Relax frontend eslint rules to warnings for unused vars
- Allow console.* for debugging (TODO: unified logger)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/routes/approvals.py

@@ -235,7 +235,7 @@ async def approve_approval(
                 "role": e.role,
                 "required_roles": e.required_roles,
             },
-        )
+        ) from e
 
     except DuplicateSignatureError as e:
         raise HTTPException(
@@ -244,13 +244,13 @@ async def approve_approval(
                 "error": "Duplicate signature",
                 "user_id": e.user_id,
             },
-        )
+        ) from e
 
     except ApprovalAlreadyDecidedError as e:
         raise HTTPException(
             status_code=400,
             detail={"error": str(e)},
-        )
+        ) from e
 
     except TOCTOUConflictError as e:
         # ⚠️ TOCTOU 衝突 - 資源狀態已改變
@@ -262,7 +262,7 @@ async def approve_approval(
                 "failed_checks": e.failed_checks,
                 "signatures_cleared": True,
             },
-        )
+        ) from e
 
 
 @router.post("/{approval_id}/reject", response_model=Approval)