feat(api): add WebUI API server with built frontend

- Add FastAPI server with WebSocket support for real-time logs
- Add crawler management API endpoints (start/stop/status)
- Add data browsing API endpoints (list files, preview, download)
- Include pre-built WebUI assets for serving frontend

API endpoints:
- POST /api/crawler/start - Start crawler task
- POST /api/crawler/stop - Stop crawler task
- GET /api/crawler/status - Get crawler status
- WS /api/ws/logs - Real-time log streaming
- GET /api/data/files - List data files
- GET /api/data/stats - Get data statistics

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

api/schemas/crawler.py

@@ -0,0 +1,98 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2025 relakkes@gmail.com
+#
+# This file is part of MediaCrawler project.
+# Repository: https://github.com/NanmiCoder/MediaCrawler/blob/main/api/schemas/crawler.py
+# GitHub: https://github.com/NanmiCoder
+# Licensed under NON-COMMERCIAL LEARNING LICENSE 1.1
+#
+# 声明：本代码仅供学习和研究目的使用。使用者应遵守以下原则：
+# 1. 不得用于任何商业用途。
+# 2. 使用时应遵守目标平台的使用条款和robots.txt规则。
+# 3. 不得进行大规模爬取或对平台造成运营干扰。
+# 4. 应合理控制请求频率，避免给目标平台带来不必要的负担。
+# 5. 不得用于任何非法或不当的用途。
+#
+# 详细许可条款请参阅项目根目录下的LICENSE文件。
+# 使用本代码即表示您同意遵守上述原则和LICENSE中的所有条款。
+
+from enum import Enum
+from typing import Optional, Literal
+from pydantic import BaseModel
+
+
+class PlatformEnum(str, Enum):
+    """支持的媒体平台"""
+    XHS = "xhs"
+    DOUYIN = "dy"
+    KUAISHOU = "ks"
+    BILIBILI = "bili"
+    WEIBO = "wb"
+    TIEBA = "tieba"
+    ZHIHU = "zhihu"
+
+
+class LoginTypeEnum(str, Enum):
+    """登录方式"""
+    QRCODE = "qrcode"
+    PHONE = "phone"
+    COOKIE = "cookie"
+
+
+class CrawlerTypeEnum(str, Enum):
+    """爬虫类型"""
+    SEARCH = "search"
+    DETAIL = "detail"
+    CREATOR = "creator"
+
+
+class SaveDataOptionEnum(str, Enum):
+    """数据保存方式"""
+    CSV = "csv"
+    DB = "db"
+    JSON = "json"
+    SQLITE = "sqlite"
+    MONGODB = "mongodb"
+    EXCEL = "excel"
+
+
+class CrawlerStartRequest(BaseModel):
+    """启动爬虫请求"""
+    platform: PlatformEnum
+    login_type: LoginTypeEnum = LoginTypeEnum.QRCODE
+    crawler_type: CrawlerTypeEnum = CrawlerTypeEnum.SEARCH
+    keywords: str = ""  # 搜索模式下的关键词
+    specified_ids: str = ""  # 详情模式下的帖子/视频ID列表，逗号分隔
+    creator_ids: str = ""  # 创作者模式下的创作者ID列表，逗号分隔
+    start_page: int = 1
+    enable_comments: bool = True
+    enable_sub_comments: bool = False
+    save_option: SaveDataOptionEnum = SaveDataOptionEnum.JSON
+    cookies: str = ""
+    headless: bool = False
+
+
+class CrawlerStatusResponse(BaseModel):
+    """爬虫状态响应"""
+    status: Literal["idle", "running", "stopping", "error"]
+    platform: Optional[str] = None
+    crawler_type: Optional[str] = None
+    started_at: Optional[str] = None
+    error_message: Optional[str] = None
+
+
+class LogEntry(BaseModel):
+    """日志条目"""
+    id: int
+    timestamp: str
+    level: Literal["info", "warning", "error", "success", "debug"]
+    message: str
+
+
+class DataFileInfo(BaseModel):
+    """数据文件信息"""
+    name: str
+    path: str
+    size: int
+    modified_at: str
+    record_count: Optional[int] = None