feat(templates): F3b 模板库 repo + 端点（GET/POST/DELETE /templates）

- TemplateRepo/SqlTemplateRepo（list/create/delete，owner stub 过滤，只 flush 端点 commit）
- schemas/templates.py（title/body min_length=1→422）+ routers/templates.py（删不存在→404）+ main 注册
- 单测：repo CRUD/owner 隔离/frozen + 端点 201/列出/204/422×2/404

packages/core/ww_core/domain/__init__.py

@@ -60,6 +60,12 @@ from ww_core.domain.style_repo import (
     StyleFingerprintView,
     StyleFingerprintWriteRepo,
 )
+from ww_core.domain.template_repo import (
+    SqlTemplateRepo,
+    TemplateCreate,
+    TemplateRepo,
+    TemplateView,
+)
 from ww_core.domain.world_entity_repo import (
     SqlWorldEntityWriteRepo,
     WorldEntityWriteRepo,
@@ -116,4 +122,8 @@ __all__ = [
     "StyleFingerprintWriteRepo",
     "StyleFingerprintView",
     "SqlStyleFingerprintWriteRepo",
+    "TemplateCreate",
+    "TemplateRepo",
+    "TemplateView",
+    "SqlTemplateRepo",
 ]

packages/core/ww_core/domain/template_repo.py

@@ -0,0 +1,105 @@
+"""提示词/模板库 Repository（F3 / 契约 §F3）。
+
+单用户本地版：作者保存/复用提示词模板，可一键填入生成器的 brief/text。**不做分享/市场**
+（需多租户）。统一按 `owner_id` 过滤（单用户原型 stub，多租户化时由认证主体替换）。
+
+提交边界：`create`/`delete` 只 `flush()` 不 `commit()`——提交交端点事务（与项目其它写侧
+repo 一致，见 memory/gotchas）。`delete` 返回是否删到行（端点据此映射 404）。
+视图是与 ORM 解耦的只读 Pydantic 快照（frozen）——路由不碰 SQLAlchemy 行。
+"""
+
+from __future__ import annotations
+
+import uuid
+from typing import Protocol
+
+from pydantic import BaseModel
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+from ww_db.models import PromptTemplate
+
+
+class TemplateView(BaseModel):
+    """模板只读快照（snake_case，frozen）。"""
+
+    model_config = {"frozen": True}
+
+    id: uuid.UUID
+    title: str
+    body: str
+    category: str | None = None
+    tool_key: str | None = None
+
+
+class TemplateCreate(BaseModel):
+    """新建模板写入字段（owner_id 由服务层补 stub）。"""
+
+    title: str
+    body: str
+    category: str | None = None
+    tool_key: str | None = None
+
+
+class TemplateRepo(Protocol):
+    """模板读写接口（按 owner_id 隔离；create/delete 只 flush）。"""
+
+    async def create(self, owner_id: uuid.UUID, data: TemplateCreate) -> TemplateView: ...
+
+    async def list_for_owner(self, owner_id: uuid.UUID) -> list[TemplateView]: ...
+
+    async def delete(self, owner_id: uuid.UUID, template_id: uuid.UUID) -> bool: ...
+
+
+def _to_view(row: PromptTemplate) -> TemplateView:
+    return TemplateView(
+        id=row.id,
+        title=row.title,
+        body=row.body,
+        category=row.category,
+        tool_key=row.tool_key,
+    )
+
+
+class SqlTemplateRepo:
+    """SQLAlchemy 实现：写/读/删 `prompt_templates`，按 owner_id 过滤（只 flush 不 commit）。"""
+
+    def __init__(self, session: AsyncSession) -> None:
+        self._s = session
+
+    async def create(self, owner_id: uuid.UUID, data: TemplateCreate) -> TemplateView:
+        row = PromptTemplate(
+            owner_id=owner_id,
+            title=data.title,
+            body=data.body,
+            category=data.category,
+            tool_key=data.tool_key,
+        )
+        self._s.add(row)
+        await self._s.flush()
+        await self._s.refresh(row)
+        return _to_view(row)
+
+    async def list_for_owner(self, owner_id: uuid.UUID) -> list[TemplateView]:
+        rows = (
+            await self._s.execute(
+                select(PromptTemplate)
+                .where(PromptTemplate.owner_id == owner_id)
+                .order_by(PromptTemplate.created_at)
+            )
+        ).scalars()
+        return [_to_view(r) for r in rows]
+
+    async def delete(self, owner_id: uuid.UUID, template_id: uuid.UUID) -> bool:
+        row = (
+            await self._s.execute(
+                select(PromptTemplate).where(
+                    PromptTemplate.owner_id == owner_id,
+                    PromptTemplate.id == template_id,
+                )
+            )
+        ).scalar_one_or_none()
+        if row is None:
+            return False
+        await self._s.delete(row)
+        await self._s.flush()
+        return True