docs: freeze YuXinGu lexicon, journey, and P1 engineering sources

Establish product language contract, user journey with dual growth engines,
ERD/OpenAPI/Go boundaries, and H5 routes (/profile, /portrait, /relation,
/membership) before P1 implementation.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/user-h5/src/pages/ExplorePage.vue

@@ -1,11 +1,12 @@
 <template>
   <main class="page">
     <h1>探索</h1>
-    <p class="sub">量表 · 数字心理 · 星镜（逐步迁入）</p>
+    <p class="sub">性格探索 · 人格测评 · 关系理解 · 个人画像</p>
     <ul class="list">
-      <li>性格测评库（对接 /api/v1/scales）</li>
-      <li>数字心理学</li>
-      <li>星镜</li>
+      <li><router-link to="/portrait">性格探索 / 个人画像</router-link></li>
+      <li>人格测评库（对接 /api/v1/scales）</li>
+      <li><router-link to="/relation">关系理解</router-link></li>
+      <li>身心探索（第二阶段）</li>
     </ul>
   </main>
 </template>
@@ -15,4 +16,5 @@
 h1{font-size:22px}
 .sub{color:var(--yxg-sub);font-size:13px;margin:6px 0 16px}
 .list{background:#fff;border-radius:16px;padding:8px 16px;line-height:2.2;font-size:14px;color:#555}
+.list a{color:inherit;text-decoration:none}
 </style>