Initial scaffold: Go backend, React frontend, Docker Compose

- Go backend: config, db (PostgreSQL migrations), auth (argon2id + sessions),
  middleware (cookie sessions, RequireAuth), chi router, cmd/server
- React frontend: Vite + React 18 + TS + Tailwind + Gruvbox palette + terminal CSS
- Docker: compose.yml (Postgres, Valkey, minio, LiveKit, coturn, Caddy),
  livekit.yaml, Caddyfile, Dockerfile (multi-stage Go+Node+Alpine)
- .env.example, .gitignore, README.md

web/src/styles/index.css

@@ -0,0 +1,78 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  :root {
+    --gb-bg-h: #1d2021;
+    --gb-bg: #282828;
+    --gb-bg-s: #3c3836;
+    --gb-bg-t: #504945;
+    --gb-bg-f: #32302f;
+    --gb-fg: #ebdbb2;
+    --gb-fg-s: #d5c4a1;
+    --gb-fg-t: #bdae93;
+    --gb-fg-f: #a89984;
+    --gb-red: #fb4934;
+    --gb-green: #b8bb26;
+    --gb-yellow: #fabd2f;
+    --gb-blue: #83a598;
+    --gb-purple: #d3869b;
+    --gb-aqua: #8ec07c;
+    --gb-orange: #fe8019;
+    --gb-gray: #928374;
+    --gb-border: #665c54;
+  }
+
+  html, body, #root {
+    @apply h-full w-full bg-gb-bg text-gb-fg font-mono;
+    font-size: 14px;
+    line-height: 1.4;
+  }
+
+  * {
+    box-sizing: border-box;
+  }
+
+  /* Scrollbars hidden for terminal feel */
+  *::-webkit-scrollbar {
+    width: 0px;
+    height: 0px;
+  }
+
+  input, textarea, button {
+    @apply bg-gb-bg-s text-gb-fg font-mono border outline-none;
+    border-color: var(--gb-border);
+  }
+
+  input:focus, textarea:focus, button:focus {
+    @apply border-gb-fg-t;
+  }
+}
+
+@layer components {
+  .terminal-border {
+    border-style: solid;
+    border-color: var(--gb-border);
+    border-width: 1px;
+  }
+
+  .terminal-button {
+    @apply px-2 py-1 bg-gb-bg-s text-gb-fg border hover:bg-gb-bg-t hover:text-gb-orange transition-colors;
+    border-color: var(--gb-border);
+  }
+
+  .terminal-input {
+    @apply px-2 py-1 bg-gb-bg-s text-gb-fg border w-full;
+    border-color: var(--gb-border);
+  }
+
+  .terminal-active {
+    @apply text-gb-orange bg-gb-bg-t;
+  }
+
+  .terminal-mention {
+    background-color: rgba(142, 192, 124, 0.12);
+    color: var(--gb-aqua);
+  }
+}