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>

apps/api/src/task/task.service.ts

@@ -0,0 +1,101 @@
+import { Injectable } from "@nestjs/common";
+import { PrismaService } from "../prisma/prisma.service.js";
+import { SentimentLedgerService } from "../relationship/sentiment-ledger.service.js";
+import { TaskSchedulerService } from "./task-scheduler.service.js";
+import { parseReminderRequest } from "./task-parser.js";
+import { acceptanceLine } from "./task-performance.js";
+import { TASK_LEDGER_EVENT, TASK_LEDGER_WEIGHT, RAPPORT_THRESHOLD } from "./constants.js";
+
+export interface CreateTaskResult {
+  task: Awaited<ReturnType<PrismaService["client"]["task"]["create"]>>;
+  performanceLine: string;
+  rapport: boolean;
+}
+
+// J-1/J-2/J-5 委託子系統核心：解析自然語句、實際建立任務（引擎責任），並附上接案演出（角色責任）。
+@Injectable()
+export class TaskService {
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly sentimentLedger: SentimentLedgerService,
+    private readonly scheduler: TaskSchedulerService,
+  ) {}
+
+  // 嘗試把使用者輸入解析為單次提醒委託；無法辨識時回傳 null（呼叫端應視為一般對話）。
+  async tryCreateFromText(
+    characterId: string,
+    userId: string,
+    text: string,
+    now: Date = new Date(),
+  ): Promise<CreateTaskResult | null> {
+    const parsed = parseReminderRequest(text, now);
+    if (!parsed) {
+      return null;
+    }
+    return this.create(
+      characterId,
+      userId,
+      { type: "ONE_TIME", content: parsed.content, rawText: text, triggerAt: parsed.triggerAt },
+      now,
+    );
+  }
+
+  async create(
+    characterId: string,
+    userId: string,
+    input: { type: "ONE_TIME" | "RECURRING" | "CONDITIONAL" | "QUERY_ORGANIZE" | "TODO_TRACKING"; content: string; rawText: string; triggerAt?: Date; cronExpression?: string; condition?: string },
+    now: Date = new Date(),
+  ): Promise<CreateTaskResult> {
+    const character = await this.prisma.client.character.findUniqueOrThrow({ where: { id: characterId } });
+
+    // J-5 默契旗標：同角色/同使用者/同類型/同內容的委託，這是第幾次了。
+    const priorCount = await this.prisma.client.task.count({
+      where: { characterId, userId, type: input.type, content: input.content },
+    });
+    const rapport = priorCount + 1 >= RAPPORT_THRESHOLD;
+
+    const task = await this.prisma.client.task.create({
+      data: {
+        characterId,
+        userId,
+        type: input.type,
+        content: input.content,
+        rawText: input.rawText,
+        triggerAt: input.triggerAt,
+        cronExpression: input.cronExpression,
+        condition: input.condition,
+      },
+    });
+
+    if (task.triggerAt) {
+      this.scheduler.scheduleTask(task.id, task.triggerAt);
+    }
+
+    // J-5 任務與關係的迴路：委託本身（接案）就寫入正向關係帳本事件，不必等到完成。
+    await this.sentimentLedger.recordEvent(
+      characterId,
+      userId,
+      TASK_LEDGER_EVENT.ACCEPTED,
+      TASK_LEDGER_WEIGHT.ACCEPTED,
+      { now },
+    );
+
+    const performanceLine = acceptanceLine(character.personalityArchetype, priorCount);
+    return { task, performanceLine, rapport };
+  }
+
+  async get(taskId: string) {
+    return this.prisma.client.task.findUnique({ where: { id: taskId } });
+  }
+
+  async listForUser(characterId: string, userId: string) {
+    return this.prisma.client.task.findMany({
+      where: { characterId, userId },
+      orderBy: { createdAt: "desc" },
+    });
+  }
+
+  async cancel(taskId: string) {
+    return this.prisma.client.task.update({ where: { id: taskId }, data: { status: "CANCELLED" } });
+  }
+}