feat: Add HTTPS/Traefik support with centralized endpoints

- Create traefik/agent-ui.yml with full routing config for domain z590.nucleoriofrio.com
- Add frontend/src/config/endpoints.ts for automatic HTTP/HTTPS detection
- Update all hardcoded localhost URLs to use relative paths
- WebSocket connections auto-detect wss:// vs ws:// based on page protocol
- Configure path-based WebSocket routing (/ws/terminal, /ws/mcp, /ws/status, /ws/whisper)
- Add commented IP whitelist middleware for future security

frontend/src/pages/SourceCodePage.vue

@@ -82,7 +82,7 @@ async function connect() {
 
   try {
     // Test connection and get repo info
-    const res = await fetch('http://localhost:4101/api/gitea/repo', {
+    const res = await fetch('/api/gitea/repo', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({
@@ -119,7 +119,7 @@ async function connect() {
 
 async function loadFileTree(path: string = '') {
   try {
-    const res = await fetch('http://localhost:4101/api/gitea/tree', {
+    const res = await fetch('/api/gitea/tree', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({
@@ -184,7 +184,7 @@ async function selectFile(node: FileNode) {
   fileContent.value = ''
 
   try {
-    const res = await fetch('http://localhost:4101/api/gitea/file', {
+    const res = await fetch('/api/gitea/file', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({