feat: 完成 B 群組 — 資料層與核心領域模型

- 導入 Prisma 7.9.1 + SQLite（better-sqlite3 driver adapter），prisma.config.ts 管理連線設定
- 完整資料模型：User／Work／Character／CharacterAlias／EpisodicMemory／SemanticMemory／
  ProceduralRule／EmotionState／Relationship／SentimentLedgerEntry
- packages/db：Prisma Client 存取層（ESM，因 Prisma 7 產出的 generated client 僅支援 ESM）
- apps/api 隨之改為 ESM 以相容 packages/db
- packages/shared：新增角色／記憶／情緒／關係共用型別，api 與 web 皆從此匯入
- prisma/seed.ts：建立測試使用者與元氣型測試角色，含完整關係帳本與記憶種子資料
- apps/api：新增 GET /characters
- scripts/smoke/B.mjs：驗證資料表齊全、API 讀出種子角色、關係與記憶可寫入讀出
- 保留 Prisma 官方隨 CLI 附的 agent skill 文件（.agents/skills 等），供後續群組查閱

npm run restart && npm run smoke -- B 皆通過（B-V），A 群組冒煙測試無回歸。

.agents/skills/prisma-cli/references/migrate-reset.md

@@ -0,0 +1,80 @@
+# prisma migrate reset
+
+Resets your database and re-applies all migrations.
+
+## Command
+
+```bash
+prisma migrate reset [options]
+```
+
+## What It Does
+
+1. **Drops** the database (if possible) or deletes all data/tables
+2. **Re-creates** the database
+3. **Applies** all migrations from `prisma/migrations/`
+4. Stops there - run seed and generate explicitly if needed
+
+**Warning: All data will be lost.**
+
+When Prisma detects an AI agent, this command is blocked until the user gives explicit consent. Follow `agent-safety.md`; `--force` skips the ordinary prompt but does not constitute user consent for an agent.
+
+## Options
+
+| Option | Description |
+|--------|-------------|
+| `--force` / `-f` | Skip confirmation prompt |
+| `--schema` | Path to schema file |
+| `--config` | Custom path to your Prisma config file |
+
+## Examples
+
+### Basic reset
+
+```bash
+prisma migrate reset
+```
+
+Prompts for confirmation in interactive terminals.
+
+### Force reset (CI/Automation)
+
+```bash
+prisma migrate reset --force
+```
+
+### With custom schema
+
+```bash
+prisma migrate reset --schema=./custom/schema.prisma
+```
+
+## When to Use
+
+- **Development**: When you want a fresh start
+- **Testing**: Resetting test database before suites
+- **Drift Recovery**: When the database is out of sync and you can't migrate
+
+## Follow-up Steps
+
+Run `prisma generate` and `prisma db seed` explicitly when you need refreshed client output or seed data after a reset.
+
+## Configuration
+
+Configure the seed script in `prisma.config.ts`, then run it explicitly after reset:
+
+```typescript
+export default defineConfig({
+  migrations: {
+    seed: 'tsx prisma/seed.ts',
+  },
+})
+```
+
+Typical workflow:
+
+```bash
+prisma migrate reset --force
+prisma generate
+prisma db seed
+```