fix: macOS support — HTML cache, launchd service, trust dialog

Three fixes for macOS deployments:

1. HTML cache bug: @fastify/static with preCompressed serves .html.br/.html.gz
   files, so path.endsWith('.html') missed them — HTML got 1-year immutable
   cache headers instead of no-cache, causing stale pages after deploys.

2. Installer launchd support: macOS now gets proper LaunchAgent setup (like
   systemd on Linux). Removes competing LaunchDaemons to prevent duplicate
   services fighting over the port. Update/uninstall also handle launchd.

3. Trust dialog auto-accept: Claude CLI 2.x shows a workspace trust prompt
   on first launch per directory. Sessions detect "trust this folder" in PTY
   output and auto-send Enter, preventing sessions from hanging on startup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/web/server.ts

@@ -544,7 +544,8 @@ export class WebServer extends EventEmitter {
       cacheControl: false,
       preCompressed: true,
       setHeaders: (res, path) => {
-        if (path.endsWith('.html')) {
+        // Use .includes() not .endsWith() — preCompressed serves .html.br/.html.gz
+        if (path.includes('.html')) {
           res.setHeader('Cache-Control', 'no-cache');
         } else {
           res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');