feat: 完成 J 群組 — 委託子系統

Task 資料表與自然語句解析（單次提醒）、依原型的接案／觸發／逾期追擊演出、
委託與關係帳本/情緒的回饋迴路（含默契旗標）、主動關照（待辦偵測＋作息交叉比對，
稀有度節流不重複台詞）、排程器可靠性（服務重啟後重新掃描 PENDING 任務掛回
JobQueue，逾期立即補觸發）。J.mjs 以 spawnSync 實際重啟服務驗證 J-7。

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

prisma/migrations/20260813061952_add_task_tables/migration.sql

@@ -0,0 +1,32 @@
+-- CreateTable
+CREATE TABLE "tasks" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "characterId" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "type" TEXT NOT NULL,
+    "content" TEXT NOT NULL,
+    "rawText" TEXT NOT NULL,
+    "triggerAt" DATETIME,
+    "cronExpression" TEXT,
+    "condition" TEXT,
+    "status" TEXT NOT NULL DEFAULT 'PENDING',
+    "triggeredAt" DATETIME,
+    "triggerMessage" TEXT,
+    "overdueNudgeCount" INTEGER NOT NULL DEFAULT 0,
+    "lastNudgeAt" DATETIME,
+    "completedAt" DATETIME,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "tasks_characterId_fkey" FOREIGN KEY ("characterId") REFERENCES "characters" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "tasks_userId_fkey" FOREIGN KEY ("userId") REFERENCES "users" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateTable
+CREATE TABLE "proactive_care_logs" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "characterId" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "message" TEXT NOT NULL,
+    "triggeredAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "proactive_care_logs_characterId_fkey" FOREIGN KEY ("characterId") REFERENCES "characters" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);