feat: 更新后端平台模块、数据库、Compute引擎及多项配置文档

- 更新 backend 平台 API、platform_store、session 数据库模块
- 新增 backend SQL 初始化脚本
- 更新 compute 引擎适配器及 README
- 更新 Docker 部署配置（app/compute）
- 更新前端入口、环境类型声明及 README
- 新增 docs/menu-functional-requirements.md 菜单功能需求文档
- 更新多项项目文档

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

backend/app/api/v1/endpoints/platform.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from typing import Any
+import uuid
 
 from fastapi import APIRouter, Body, File, HTTPException, Query, UploadFile
 from fastapi.responses import PlainTextResponse
@@ -147,7 +148,7 @@ async def delete_model(model_id: str) -> dict[str, Any]:
 
 @router.post("/model-manage/merge")
 async def merge_model(payload: dict[str, Any] = Body(...)) -> dict[str, Any]:
-    return ok({"job_id": "merge-sample-job", "status": "queued", **payload})
+    return ok({"job_id": f"merge_{uuid.uuid4().hex[:12]}", "status": "queued", **payload})
 
 
 @router.get("/dataset-manage/preview/{file_id}")
@@ -289,8 +290,11 @@ async def fine_tune_list() -> dict[str, Any]:
 
 @router.post("/fine-tune")
 async def create_fine_tune(payload: dict[str, Any] = Body(...)) -> dict[str, Any]:
-    task = get_platform_store().create_task(payload)
-    return ok({"id": task["id"]})
+    try:
+        task = get_platform_store().create_task(payload)
+        return ok({"id": task["id"]})
+    except ValueError as exc:
+        raise fail(400, str(exc))
 
 
 @router.post("/fine-tune/start")
@@ -361,7 +365,10 @@ async def compute_nodes() -> dict[str, Any]:
 
 @router.post("/compute/nodes")
 async def create_compute_node(payload: dict[str, Any] = Body(...)) -> dict[str, Any]:
-    return ok({"id": "node_sample_new", **payload, "status": "created"})
+    try:
+        return ok(get_platform_store().create_compute_node(payload))
+    except KeyError as exc:
+        raise fail(400, f"missing field: {exc}")
 
 
 @router.put("/compute/nodes/{node_id}")