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-tauri/src/commands/coding_plan.rs

@@ -0,0 +1,9 @@
+use crate::services::subscription::SubscriptionQuota;
+
+#[tauri::command]
+pub async fn get_coding_plan_quota(
+    base_url: String,
+    api_key: String,
+) -> Result<SubscriptionQuota, String> {
+    crate::services::coding_plan::get_coding_plan_quota(&base_url, &api_key).await
+}