fix: enhance WebSocket stability, resolve XHTTP configurations and fix UI loading shifts (#3997)

* feat: implement real-time traffic monitoring and UI updates using a high-performance WebSocket hub and background job system

* feat: add bulk client management support and improve inbound data handling

* Fix bug

* **Fixes & Changes:**
1. **Fixed XPadding Placement Dropdown**:
   - Added the missing `cookie` and `query` options to `xPaddingPlacement` (`stream_xhttp.html`).
   - *Why:* Previously, users wanting `cookie` obfuscation were forced to use the `header` placement string. This caused Xray-core to blindly intercept the entire monolithic HTTP Cookie header, failing internal padding-length validations and causing the inbound to silently drop the connection.
2. **Fixed Uplink Data Placement Validation**:
   - Replaced the unsupported `query` option with `cookie` in `uplinkDataPlacement`.
   - *Why:* Xray-core's `transport_internet.go` explicitly forbids `query` as an uplink placement option. Selecting it from the UI previously sent a payload that would cause Xray-core to instantly throw an `unsupported uplink data placement: query` panic. Adding `cookie` perfectly aligns the UI with Xray-core restrictions.
### Related Issues
- Resolves #3992

* This commit fixes structural payload issues preventing XHTTP from functioning correctly and eliminates WebSocket log spam.
- **[Fix X-Padding UI]** Added missing `cookie` and `query` options to X-Padding Placement. Fixes the issue where using Cookie fallback triggers whole HTTP Cookie header interception and silent drop in Xray-core. (Resolves [#3992](https://github.com/MHSanaei/3x-ui/issues/3992))
- **[Fix Uplink Data Options]** Replaced the invalid `query` option with `cookie` in Uplink Data Placement dropdown to prevent Xray-core backend panic `unsupported uplink data placement: query`.
- **[Fix WebSockets Spam]** Boosted `maxMessageSize` boundary to 100MB and gracefully handled fallback fetch signals via `broadcastInvalidate` to avoid buffer dropping spam. (Resolves [#3984](https://github.com/MHSanaei/3x-ui/issues/3984))

* Fix

* gofmt

* fix(websocket): resolve channel race condition and graceful shutdown deadlock

* Fix: inbounds switch

* Change max quantity from 10000 to 500

* fix

web/assets/js/model/dbinbound.js

@@ -90,7 +90,16 @@ class DBInbound {
         return this.expiryTime < new Date().getTime();
     }
 
+    invalidateCache() {
+        this._cachedInbound = null;
+        this._clientStatsMap = null;
+    }
+
     toInbound() {
+        if (this._cachedInbound) {
+            return this._cachedInbound;
+        }
+
         let settings = {};
         if (!ObjectUtil.isEmpty(this.settings)) {
             settings = JSON.parse(this.settings);
@@ -116,7 +125,21 @@ class DBInbound {
             sniffing: sniffing,
             clientStats: this.clientStats,
         };
-        return Inbound.fromJson(config);
+        
+        this._cachedInbound = Inbound.fromJson(config);
+        return this._cachedInbound;
+    }
+
+    getClientStats(email) {
+        if (!this._clientStatsMap) {
+            this._clientStatsMap = new Map();
+            if (this.clientStats && Array.isArray(this.clientStats)) {
+                for (const stats of this.clientStats) {
+                    this._clientStatsMap.set(stats.email, stats);
+                }
+            }
+        }
+        return this._clientStatsMap.get(email);
     }
 
     isMultiUser() {