feat(遊戲化): 新增大廳、附身、時間流、後日談進度等遊戲化系統功能

新增角色大廳（lobby）邀約與通話、附身（possession）、時鐘（clock）抽象、
時間流與睡眠負債、後日談進度、行為選擇與旁觀反應等模組，並補齊對應冒煙
測試（R~V）與單元測試；同步調整 web/mobile 對應頁面與元件。

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

prisma/migrations/20260819165057_t43_possession/migration.sql

@@ -0,0 +1,27 @@
+-- CreateTable
+CREATE TABLE "pending_lobby_calls" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "userId" TEXT NOT NULL,
+    "characterId" TEXT NOT NULL,
+    "text" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "pending_lobby_calls_userId_fkey" FOREIGN KEY ("userId") REFERENCES "users" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "pending_lobby_calls_characterId_fkey" FOREIGN KEY ("characterId") REFERENCES "characters" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_users" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "name" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    "possessingCharacterId" TEXT,
+    CONSTRAINT "users_possessingCharacterId_fkey" FOREIGN KEY ("possessingCharacterId") REFERENCES "characters" ("id") ON DELETE SET NULL ON UPDATE CASCADE
+);
+INSERT INTO "new_users" ("createdAt", "id", "name", "updatedAt") SELECT "createdAt", "id", "name", "updatedAt" FROM "users";
+DROP TABLE "users";
+ALTER TABLE "new_users" RENAME TO "users";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;