feat: complete Phase 1 - game library, lifecycle, realtime sync

- Seed 33 popular games across 5 platforms via admin API script
- Add GameDetailDialog with game info and quick-team button
- Update GamesLibrary with game card click to open detail dialog
- Update Home hot games to open detail dialog instead of navigating
- Rewrite invitation accept: frontend auto-joins team + updates status
- Add user status reset on team dissolution (endGame)
- Add start game / dissolve buttons to TeamSessionPanel lifecycle
- Integrate realtime subscriptions in GroupView and Layout
- Add notification store realtime invitation listener
- Add placeholder images for game covers and avatars
- Remove Go hooks, add JS hooks placeholder + Docker mount

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/components/game/GameDetailDialog.vue

@@ -0,0 +1,131 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import type { Game } from '@/types'
+
+const props = defineProps<{
+  modelValue: boolean
+  game: Game | null
+}>()
+
+const emit = defineEmits<{
+  'update:modelValue': [value: boolean]
+  'create-team': [gameName: string]
+}>()
+
+const visible = computed({
+  get: () => props.modelValue,
+  set: (val) => emit('update:modelValue', val)
+})
+
+function handleCreateTeam() {
+  if (props.game) {
+    emit('create-team', props.game.name)
+    visible.value = false
+  }
+}
+</script>
+
+<template>
+  <el-dialog v-model="visible" width="440px" :show-close="true">
+    <template v-if="game">
+      <div class="game-detail">
+        <div class="detail-cover-wrap">
+          <img
+            :src="game.cover || '/game-placeholder.png'"
+            :alt="game.name"
+            class="detail-cover"
+          />
+        </div>
+
+        <h2 class="detail-name">{{ game.name }}</h2>
+
+        <div class="detail-meta">
+          <span v-if="game.platform" class="platform-badge">{{ game.platform }}</span>
+          <span class="popularity">🔥 {{ game.popularCount }} 人游玩</span>
+        </div>
+
+        <div v-if="game.tags?.length" class="detail-tags">
+          <span v-for="tag in game.tags" :key="tag" class="tag">{{ tag }}</span>
+        </div>
+
+        <el-button type="primary" class="team-btn" @click="handleCreateTeam">
+          快速组队
+        </el-button>
+      </div>
+    </template>
+  </el-dialog>
+</template>
+
+<style scoped>
+.game-detail {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 16px;
+  padding: 8px 0;
+}
+
+.detail-cover-wrap {
+  width: 200px;
+  height: 260px;
+  border-radius: var(--gg-radius-md);
+  overflow: hidden;
+  background: var(--gg-bg-elevated);
+  border: 1px solid var(--gg-border);
+}
+
+.detail-cover {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+
+.detail-name {
+  margin: 0;
+  font-size: 22px;
+  font-weight: 700;
+  color: var(--gg-text);
+  text-align: center;
+}
+
+.detail-meta {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.platform-badge {
+  padding: 4px 14px;
+  background: rgba(168, 85, 247, 0.15);
+  color: var(--gg-accent);
+  border-radius: 6px;
+  font-size: 13px;
+  font-weight: 600;
+}
+
+.popularity {
+  font-size: 14px;
+  color: var(--gg-text-secondary);
+}
+
+.detail-tags {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  justify-content: center;
+}
+
+.tag {
+  padding: 4px 12px;
+  background: var(--gg-bg-elevated);
+  border-radius: 6px;
+  font-size: 12px;
+  color: var(--gg-primary);
+  font-weight: 500;
+}
+
+.team-btn {
+  width: 100%;
+  margin-top: 4px;
+}
+</style>

frontend/src/components/team/TeamSessionPanel.vue

@@ -19,6 +19,14 @@ const memberDetails = computed(() => {
     .filter((m): m is NonNullable<typeof m> => Boolean(m))
 })
 
+async function startGame() {
+  try {
+    await teamStore.updateStatus('playing')
+  } catch {
+    // ignore
+  }
+}
+
 async function endGame() {
   try {
     await ElMessageBox.confirm(
@@ -67,9 +75,15 @@ async function endGame() {
       </div>
     </div>
 
-    <button class="end-game-btn" @click="endGame">
+    <button v-if="session.status === 'recruiting'" class="start-game-btn" @click="startGame">
+      开始游戏
+    </button>
+    <button v-else-if="session.status === 'playing'" class="end-game-btn" @click="endGame">
       游戏结束
     </button>
+    <button v-if="session.status === 'recruiting'" class="dissolve-btn" @click="endGame">
+      解散小组
+    </button>
   </div>
 
   <div v-else class="no-session">
@@ -177,6 +191,43 @@ async function endGame() {
   color: var(--gg-text);
 }
 
+.start-game-btn {
+  width: 100%;
+  padding: 12px;
+  margin-bottom: 8px;
+  border: none;
+  border-radius: var(--gg-radius-sm);
+  background: var(--gg-gradient-green);
+  color: white;
+  font-size: 14px;
+  font-weight: 600;
+  cursor: pointer;
+  transition: opacity 0.2s, box-shadow 0.2s;
+}
+
+.start-game-btn:hover {
+  opacity: 0.9;
+  box-shadow: 0 4px 16px rgba(5, 150, 105, 0.3);
+}
+
+.dissolve-btn {
+  width: 100%;
+  padding: 10px;
+  border: 1px solid var(--gg-border);
+  border-radius: var(--gg-radius-sm);
+  background: transparent;
+  color: var(--gg-text-secondary);
+  font-size: 13px;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.dissolve-btn:hover {
+  border-color: var(--gg-danger);
+  color: var(--gg-danger);
+}
+
 .end-game-btn {
   width: 100%;
   padding: 12px;