chore: backend fixes + vite config + AppShell cleanup

- pyproject.toml: add httpx>=0.27.0 dependency.
- frontend/vite.config.js: bind port to 31400, strictPort, proxy /api -> 31401.
- start.sh: rewrite as detached daemon (nohup + disown + PID files);
  re-running is treated as restart.
- .gitignore: ignore .run/ (PID files).
- frontend AppShell.vue: drop unused GitHub Star link.

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

frontend/src/components/AppShell.vue

@@ -29,18 +29,6 @@
       >
         Gallery
       </router-link>
-
-      <a
-        href="https://github.com/yzaparto/mirosociety"
-        target="_blank"
-        rel="noopener noreferrer"
-        class="flex items-center gap-1.5 text-sm text-slate-500 hover:text-slate-900 px-3 py-1.5 rounded-md hover:bg-gray-50 transition-colors"
-      >
-        <svg class="w-4 h-4" viewBox="0 0 16 16" fill="currentColor">
-          <path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0016 8c0-4.42-3.58-8-8-8z"/>
-        </svg>
-        <span>Star</span>
-      </a>
     </nav>
 
     <main :class="hideShell ? '' : 'flex-1'">

frontend/vite.config.js

@@ -4,10 +4,11 @@ import vue from '@vitejs/plugin-vue'
 export default defineConfig({
   plugins: [vue()],
   server: {
-    port: 3000,
+    port: 31400,
+    strictPort: true,
     proxy: {
       '/api': {
-        target: 'http://localhost:8000',
+        target: 'http://localhost:31401',
         changeOrigin: true,
       },
     },