chore(v2): 从兴邦预审v2白名单抽取独立可运行基座

按 docs/v2/05-implementation-plan.md §1 候选迁移表与 claude_use/T00 白名单，
从 55e2cdb 抽取 224 个文件（2.48 MB）到独立目录 F:/mini-OpenClaw-v2。

- 排除：凭据(.env/server-deploy.conf/旧DELIVERY.md)、运行数据(xingbang_data 等
  4 个 SQLite)、依赖(venv/node_modules 符号链接)、归档(_backup*/test-evidence/
  ori_file)、Office 临时文件
- 目标目录独立 git 仓库，初始恢复点；Gitea 远程与分支待 OQ-06 Q2 定案
- 未部署、未启动服务、未调用模型

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

backend/api/sessions.py

@@ -0,0 +1,123 @@
+"""Session CRUD API — list / create / rename / delete / raw messages / generate title."""
+
+import os
+import uuid
+from pathlib import Path
+
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel
+
+from graph.session_manager import session_manager
+from graph.prompt_builder import build_system_prompt
+
+router = APIRouter()
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+
+# ── Request models ──────────────────────────────────────────
+
+class RenameRequest(BaseModel):
+    title: str
+
+
+# ── Endpoints ───────────────────────────────────────────────
+
+@router.get("/sessions")
+async def list_sessions():
+    """List all sessions with title and metadata."""
+    sessions = session_manager.list_sessions()
+    return {"sessions": sessions}
+
+
+@router.post("/sessions")
+async def create_session():
+    """Create a new empty session."""
+    session_id = f"session-{uuid.uuid4().hex[:12]}"
+    meta = session_manager.create_session(session_id)
+    return meta
+
+
+@router.put("/sessions/{session_id}")
+async def rename_session(session_id: str, req: RenameRequest):
+    """Rename an existing session."""
+    try:
+        session_manager.rename_session(session_id, req.title)
+    except FileNotFoundError:
+        raise HTTPException(status_code=404, detail="Session not found")
+    return {"id": session_id, "title": req.title}
+
+
+@router.delete("/sessions/{session_id}")
+async def delete_session(session_id: str):
+    """Delete a session."""
+    session_manager.delete_session(session_id)
+    return {"status": "deleted", "id": session_id}
+
+
+@router.get("/sessions/{session_id}/messages")
+async def get_raw_messages(session_id: str):
+    """Get complete raw messages including system prompt."""
+    data = session_manager.get_raw_messages(session_id)
+    system_prompt = build_system_prompt(BASE_DIR)
+    # Prepend system prompt as the first message
+    all_messages = [{"role": "system", "content": system_prompt}] + data.get("messages", [])
+    return {"session_id": session_id, "title": data.get("title", ""), "messages": all_messages}
+
+
+@router.get("/sessions/{session_id}/history")
+async def get_session_history(session_id: str):
+    """Get conversation history for display (no system prompt, includes tool_calls)."""
+    messages = session_manager.load_session(session_id)
+    return {"session_id": session_id, "messages": messages}
+
+
+@router.post("/sessions/{session_id}/generate-title")
+async def generate_title(session_id: str):
+    """Use DeepSeek to generate a short title from the first conversation turn."""
+    messages = session_manager.load_session(session_id)
+    if not messages:
+        raise HTTPException(status_code=400, detail="No messages to generate title from")
+
+    # Get the first user message and first assistant reply
+    first_user = ""
+    first_assistant = ""
+    for msg in messages:
+        if msg["role"] == "user" and not first_user:
+            first_user = msg["content"][:200]
+        elif msg["role"] == "assistant" and not first_assistant:
+            first_assistant = msg["content"][:200]
+        if first_user and first_assistant:
+            break
+
+    if not first_user:
+        raise HTTPException(status_code=400, detail="No user message found")
+
+    try:
+        from langchain_deepseek import ChatDeepSeek
+        from langchain_core.messages import HumanMessage as HM
+
+        llm = ChatDeepSeek(
+            model=os.getenv("DEEPSEEK_MODEL", "deepseek-chat"),
+            api_key=os.getenv("DEEPSEEK_API_KEY"),
+            api_base=os.getenv("DEEPSEEK_BASE_URL", "https://api.deepseek.com"),
+            temperature=0.3,
+        )
+
+        prompt = (
+            f"根据以下对话内容，生成一个不超过10个字的中文标题，只输出标题文本，不要加引号或标点。\n\n"
+            f"用户: {first_user}\n"
+            f"助手: {first_assistant}"
+        )
+
+        result = await llm.ainvoke([HM(content=prompt)])
+        title = result.content.strip().strip('"\'""''')[:20]
+
+        session_manager.update_title(session_id, title)
+        return {"session_id": session_id, "title": title}
+
+    except Exception as e:
+        # Fallback: use first few chars of user message
+        fallback_title = first_user[:10].strip()
+        session_manager.update_title(session_id, fallback_title)
+        return {"session_id": session_id, "title": fallback_title}