feat(clients): add bulk enable/disable and move selection actions into More menu

Add bulkEnable/bulkDisable named endpoints backed by a shared internal impl, and consolidate the per-selection actions (attach, detach, add to group, ungroup, enable, disable, adjust, sub links) into the clients table's More dropdown so the toolbar only shows the selection count and delete. Translate the new enable/disable confirm dialogs and toasts across all 13 locales.

frontend/src/pages/api-docs/endpoints.ts

@@ -648,6 +648,20 @@ export const sections: readonly Section[] = [
         body: '{\n  "emails": ["alice", "bob"],\n  "addDays": 30,\n  "addBytes": 53687091200,\n  "flow": "xtls-rprx-vision"\n}',
         response: '{\n  "success": true,\n  "obj": {\n    "adjusted": 2,\n    "skipped": [\n      { "email": "carol", "reason": "unlimited expiry" }\n    ]\n  }\n}',
       },
+      {
+        method: 'POST',
+        path: '/panel/api/clients/bulkEnable',
+        summary: 'Enable many clients in one call. Emails are grouped by inbound and applied with a single read-modify-write per inbound; the running Xray (local or remote node) is updated to add each user. Note that enabling a client whose quota is exhausted or whose expiry has passed only flips the flag — the traffic loop will disable it again on the next tick. Returns the changed count and per-email skip reasons.',
+        body: '{\n  "emails": ["alice", "bob"]\n}',
+        response: '{\n  "success": true,\n  "obj": {\n    "changed": 2,\n    "skipped": [\n      { "email": "carol", "reason": "client not found" }\n    ]\n  }\n}',
+      },
+      {
+        method: 'POST',
+        path: '/panel/api/clients/bulkDisable',
+        summary: 'Disable many clients in one call. Emails are grouped by inbound and applied with a single read-modify-write per inbound; the running Xray (local or remote node) is updated to remove each user. Returns the changed count and per-email skip reasons.',
+        body: '{\n  "emails": ["alice", "bob"]\n}',
+        response: '{\n  "success": true,\n  "obj": {\n    "changed": 2,\n    "skipped": [\n      { "email": "carol", "reason": "client not found" }\n    ]\n  }\n}',
+      },
       {
         method: 'POST',
         path: '/panel/api/clients/bulkDel',