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/20260819062301_t32_sleep_debt/migration.sql

@@ -0,0 +1,12 @@
+-- CreateTable
+CREATE TABLE "sleep_debts" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "characterId" TEXT NOT NULL,
+    "accumulatedMinutes" REAL NOT NULL DEFAULT 0,
+    "lastReconciledDate" DATETIME,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "sleep_debts_characterId_fkey" FOREIGN KEY ("characterId") REFERENCES "characters" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "sleep_debts_characterId_key" ON "sleep_debts"("characterId");