feat: add Token Plan quota query for Kimi, Zhipu GLM, and MiniMax

Add a new "Token Plan" template type in the usage query panel that
natively queries quota/usage from Chinese coding plan providers
(Kimi For Coding, Zhipu GLM, MiniMax) without requiring custom scripts.

- Rust backend: new coding_plan service with provider-specific API
  queries (Kimi /v1/usages, Zhipu /api/monitor/usage/quota/limit,
  MiniMax /coding_plan/remains) normalized into UsageResult
- Frontend: Token Plan template in UsageScriptModal with auto-detection
  of provider based on ANTHROPIC_BASE_URL pattern matching
- Follows the same pattern as GitHub Copilot template (dedicated API
  path in queryProviderUsage, no JS script needed)

src/lib/api/subscription.ts

@@ -4,4 +4,9 @@ import type { SubscriptionQuota } from "@/types/subscription";
 export const subscriptionApi = {
   getQuota: (tool: string): Promise<SubscriptionQuota> =>
     invoke("get_subscription_quota", { tool }),
+  getCodingPlanQuota: (
+    baseUrl: string,
+    apiKey: string,
+  ): Promise<SubscriptionQuota> =>
+    invoke("get_coding_plan_quota", { baseUrl, apiKey }),
 };