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/db-execute.md

@@ -0,0 +1,78 @@
+# prisma db execute
+
+Execute native commands (SQL) to your database.
+
+## Command
+
+```bash
+prisma db execute [options]
+```
+
+## What It Does
+
+- Connects to your database using the configured datasource
+- Executes a script provided via file (`--file`) or stdin (`--stdin`)
+- Useful for running raw SQL, maintenance tasks, or applying diffs from `migrate diff`
+- Not supported on MongoDB
+
+## Options
+
+| Option | Description |
+|--------|-------------|
+| `--file` | Path to a file containing the script to execute |
+| `--stdin` | Use terminal standard input as the script |
+| `--config` | Custom path to your Prisma config file |
+
+## Current Option Surface
+
+`prisma db execute` uses the datasource configured in `prisma.config.ts`. Use `--config` if you need a separate config file for another environment.
+
+## Examples
+
+### Execute from file
+
+```bash
+prisma db execute --file ./script.sql
+```
+
+### Execute from stdin
+
+```bash
+echo "TRUNCATE TABLE User;" | prisma db execute --stdin
+```
+
+### Execute `migrate diff` output
+
+Pipe the output of `migrate diff` directly to the database:
+
+```bash
+prisma migrate diff \
+  --from-empty \
+  --to-schema prisma/schema.prisma \
+  --script \
+| prisma db execute --stdin
+```
+
+## Configuration
+
+Uses `datasource` from `prisma.config.ts`:
+
+```typescript
+export default defineConfig({
+  datasource: {
+    url: env('DATABASE_URL'),
+  },
+})
+```
+
+## Use Cases
+
+- **Manual Migrations**: Applying raw SQL changes
+- **Data Maintenance**: Truncating tables, cleaning up data
+- **Schema Synchronization**: Applying `migrate diff` scripts
+- **Debugging**: Running test queries (though typically not for fetching data)
+
+## Limitations
+
+- **No Data Return**: The command reports success/failure, not query results (rows). Use Prisma Client or `prisma studio` to view data.
+- **SQL Only**: Primarily for SQL databases.