refactor(usage): consolidate query logic to eliminate DRY violations

Breaking Changes:
- Removed useAutoUsageQuery hook (119 lines)
- Unified all usage queries into single useUsageQuery hook

Technical Improvements:
- Eliminated duplicate state management (React Query + manual useState)
- Fixed single source of truth principle violation
- Replaced manual setInterval with React Query's built-in refetchInterval
- Reduced UsageFooter complexity by 28% (54 → 39 lines)

New Features:
- useUsageQuery now accepts autoQueryInterval option
- Automatic query interval control (0 = disabled, min 1 minute)
- Built-in lastQueriedAt timestamp from dataUpdatedAt
- Auto-query only enabled for currently active provider

Architecture Benefits:
- Single data source: manual and auto queries share same cache
- No more state inconsistency between manual/auto query results
- Leverages React Query's caching, deduplication, and background updates
- Cleaner separation of concerns

Code Changes:
- src/lib/query/queries.ts: Enhanced useUsageQuery with auto-query support
- src/components/UsageFooter.tsx: Simplified to use single query hook
- src/hooks/useAutoUsageQuery.ts: Deleted (redundant)
- All type checks passed

src/components/UsageScriptModal.tsx

@@ -2,7 +2,7 @@ import React, { useState } from "react";
 import { Play, Wand2 } from "lucide-react";
 import { toast } from "sonner";
 import { useTranslation } from "react-i18next";
-import { Provider, UsageScript } from "../types";
+import { Provider, UsageScript } from "@/types";
 import { usageApi, type AppId } from "@/lib/api";
 import JsonEditor from "./JsonEditor";
 import * as prettier from "prettier/standalone";