⚡ feat: implement GET request deduplication in API layer

Add request deduplication mechanism to prevent duplicate GET requests
to the same endpoint within the same timeframe, significantly reducing
unnecessary network overhead.

**Changes:**
- Add `patchAPIInstance()` function to intercept and deduplicate GET requests
- Implement in-flight request tracking using Map with URL+params as unique keys
- Apply deduplication patch to both initial API instance and `updateAPI()` recreated instances
- Add `disableDuplicate: true` config option to bypass deduplication when needed

**Benefits:**
- Eliminates redundant API calls caused by component re-renders or rapid user interactions
- Reduces server load and improves application performance
- Provides automatic protection against accidental duplicate requests
- Maintains backward compatibility with existing code

**Technical Details:**
- Uses Promise sharing for identical concurrent requests
- Automatically cleans up completed requests from tracking map
- Preserves original axios functionality with minimal overhead
- Zero breaking changes to existing API usage

Addresses the issue observed in EditChannel.js where multiple calls
were made to the same endpoints during component lifecycle.

web/src/helpers/api.js

@@ -12,6 +12,36 @@ export let API = axios.create({
   },
 });
 
+function patchAPIInstance(instance) {
+  const originalGet = instance.get.bind(instance);
+  const inFlightGetRequests = new Map();
+
+  const genKey = (url, config = {}) => {
+    const params = config.params ? JSON.stringify(config.params) : '{}';
+    return `${url}?${params}`;
+  };
+
+  instance.get = (url, config = {}) => {
+    if (config?.disableDuplicate) {
+      return originalGet(url, config);
+    }
+
+    const key = genKey(url, config);
+    if (inFlightGetRequests.has(key)) {
+      return inFlightGetRequests.get(key);
+    }
+
+    const reqPromise = originalGet(url, config).finally(() => {
+      inFlightGetRequests.delete(key);
+    });
+
+    inFlightGetRequests.set(key, reqPromise);
+    return reqPromise;
+  };
+}
+
+patchAPIInstance(API);
+
 export function updateAPI() {
   API = axios.create({
     baseURL: import.meta.env.VITE_REACT_APP_SERVER_URL
@@ -22,6 +52,8 @@ export function updateAPI() {
       'Cache-Control': 'no-store',
     },
   });
+
+  patchAPIInstance(API);
 }
 
 API.interceptors.response.use(