feat: bootstrap temporserv project scaffold

Add the initial project blueprint, Go backend skeleton, frontend app shell, database schema draft, and local development/deployment files.

apps/web/src/stores/player-store.ts

@@ -0,0 +1,16 @@
+import { create } from 'zustand'
+import type { Track } from '@/lib/api'
+
+type PlayerState = {
+  currentTrack: Track | null
+  queue: Track[]
+  setQueue: (tracks: Track[]) => void
+  playTrack: (track: Track) => void
+}
+
+export const usePlayerStore = create<PlayerState>((set) => ({
+  currentTrack: null,
+  queue: [],
+  setQueue: (queue) => set({ queue, currentTrack: queue[0] ?? null }),
+  playTrack: (currentTrack) => set({ currentTrack }),
+}))