feat(frontend): Monitoramento em tempo real (WebSocket via proxy SSE)

O RealtimeGateway (backend, desde a PHASE 13) autentica a conexão
socket.io via auth.token no handshake — um JWT bruto que um
EventSource/WebSocket do browser não tem como mandar sem passar por JS
legível no client, quebrando o princípio seguido em todo o resto do
frontend (token só existe no cookie httpOnly). Resolvido com um proxy:
apps/frontend/src/app/api/monitoring/stream/route.ts roda no servidor,
conecta no socket.io real com o access token do lado do servidor, e
reencaminha cada evento pro browser como Server-Sent Events — o
EventSource do client só precisa do cookie de sessão, nunca do token.

/app/monitoramento: badge de conexão, contadores de sessão (chamadas
criadas/atendidas/encerradas), filas ao vivo (QUEUE_MEMBER_COUNT), estado
de agentes ao vivo (AGENT_STATE_CHANGED, semeado do GET /agents inicial),
feed dos últimos 50 eventos. Menu "Monitoramento" vira 1 link direto em
vez de 5 sub-itens placeholder — o painel novo já cobre tudo numa página
só.

Testado ponta a ponta contra o pipeline real (não simulado): cliente
socket.io cru confirmou a API entregando o evento, curl -N confirmou o
proxy reencaminhando, e com a página aberta de verdade num browser
(Puppeteer) disparei POST /agents/me/login e /logout por fora — o badge
do agente mudou ao vivo e os eventos apareceram no feed sem recarregar a
página. Smoke test de regressão nas 19 telas anteriores, todas 200.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BFaBaBSQGhyXGEgtTYZGV8

pnpm-lock.yaml

@@ -237,6 +237,9 @@ importers:
       server-only:
         specifier: 0.0.1
         version: 0.0.1
+      socket.io-client:
+        specifier: 4.8.3
+        version: 4.8.3
       tailwind-merge:
         specifier: 2.5.5
         version: 2.5.5
@@ -2028,6 +2031,9 @@ packages:
     resolution: {integrity: sha512-i6UzDscO/XfAcNYD75CfICkmfLedpyPDdozrLMmQc5ORaQcdMoc21OnlEylMIqI7U8eniKrPMxxtj8k0vhmJhA==}
     engines: {node: '>=14'}
 
+  engine.io-client@6.6.6:
+    resolution: {integrity: sha512-iY6QdftLQ9pyiPoX082bpf/u1UewnOaJrtJIF9T0++QB34lZrj0uP+Q/bj8AlUsAxqhnkTV2BS8SBZSxOmoV5Q==}
+
   engine.io-parser@5.2.3:
     resolution: {integrity: sha512-HqD3yTBfnBxIrbnM1DoD6Pcq8NECnh8d4As1Qgh0z5Gg3jRRIqijury0CL3ghu/edArpUYiYqQiDUQBIs4np3Q==}
     engines: {node: '>=10.0.0'}
@@ -2777,6 +2783,10 @@ packages:
   socket.io-adapter@2.5.8:
     resolution: {integrity: sha512-6Oy52pbg+kvdCVvjcN+FnY7BvxZ7cIHNScbvztT/It5d0vbwoJoVZmF2gjJmnV0/4WlXRfG15zc45ySk9Ah8bw==}
 
+  socket.io-client@4.8.3:
+    resolution: {integrity: sha512-uP0bpjWrjQmUt5DTHq9RuoCBdFJF10cdX9X+a368j/Ft0wmaVgxlrjvK3kjvgCODOMMOz9lcaRzxmso0bTWZ/g==}
+    engines: {node: '>=10.0.0'}
+
   socket.io-parser@4.2.7:
     resolution: {integrity: sha512-IH/iSeO9T6gz1KkFleGDWkG9N3dl4jXVYUtMhIqH10Md0ttMer8nUNWiP1DKuNrybD2xBrixLJdCC9J6ECoYkg==}
     engines: {node: '>=10.0.0'}
@@ -2973,6 +2983,10 @@ packages:
     resolution: {integrity: sha512-ghig2TBE/H11aOVgmahA3MhimvkBr6JIYknH/Dhdk10nXwdbIqBJsbfMxpvFPG8bAw77gN29aQWvKpmVoPlvPQ==}
     engines: {node: '>=16.0.0'}
 
+  xmlhttprequest-ssl@2.1.2:
+    resolution: {integrity: sha512-TEU+nJVUUnA4CYJFLvK5X9AOeH4KvDvhIfm0vV1GaQRtchnG0hgK5p8hw/xjv8cunWYCsiPCSDzObPyhEwq3KQ==}
+    engines: {node: '>=0.4.0'}
+
   xtend@4.0.2:
     resolution: {integrity: sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==}
     engines: {node: '>=0.4'}
@@ -4548,6 +4562,18 @@ snapshots:
 
   empathic@2.0.0: {}
 
+  engine.io-client@6.6.6:
+    dependencies:
+      '@socket.io/component-emitter': 3.1.2
+      debug: 4.4.3
+      engine.io-parser: 5.2.3
+      ws: 8.21.3
+      xmlhttprequest-ssl: 2.1.2
+    transitivePeerDependencies:
+      - bufferutil
+      - supports-color
+      - utf-8-validate
+
   engine.io-parser@5.2.3: {}
 
   engine.io@6.6.9:
@@ -5311,6 +5337,17 @@ snapshots:
       - supports-color
       - utf-8-validate
 
+  socket.io-client@4.8.3:
+    dependencies:
+      '@socket.io/component-emitter': 3.1.2
+      debug: 4.4.3
+      engine.io-client: 6.6.6
+      socket.io-parser: 4.2.7
+    transitivePeerDependencies:
+      - bufferutil
+      - supports-color
+      - utf-8-validate
+
   socket.io-parser@4.2.7:
     dependencies:
       '@socket.io/component-emitter': 3.1.2
@@ -5509,6 +5546,8 @@ snapshots:
 
   xml-naming@0.3.0: {}
 
+  xmlhttprequest-ssl@2.1.2: {}
+
   xtend@4.0.2: {}
 
   yaml@2.9.0: {}