chore: 清理无用文件并更新 CLAUDE.md 至 v0.9.0

清理：
- 删除含硬编码敏感信息的脚本（run_celery.py, start-celery.sh）
- 删除冗余开发脚本（setup.sh, start-backend.sh, start-frontend.sh）
- 删除冗余文档（about.md, PROJECT_STRUCTURE.md, QUICKSTART.md, OLT时间同步.md）
- 删除调试文件（backend/test_parser.py）
- 删除 JWT 密钥文件（backend/token_jwt_key.pem）
- .gitignore 添加 *.pem 忽略规则

CLAUDE.md 更新：
- 版本号 v0.8.0 → v0.9.0
- 新增 v0.9.0 功能：操作记录日志、OLT时间同步、IMC集成
- 补全 API 端点文档（从5个分类扩展到13个分类、50+端点）
- 添加 More 分页标记清理经验教训
- 添加提交前清理文件规则
- 更新项目结构和快速启动指南

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/test_parser.py

@@ -1,30 +0,0 @@
-"""测试 ONU 状态解析"""
-import re
-
-def parse_onu_status(output: str):
-    """解析 ONU 状态"""
-    devices = {}
-    lines = output.split('\n')
-
-    for line in lines:
-        mac_match = re.search(r'([0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4})', line, re.IGNORECASE)
-        if mac_match:
-            mac = mac_match.group(1).lower()
-            if 'Up' in line:
-                devices[mac] = 'online'
-            elif 'Offline' in line:
-                devices[mac] = 'offline'
-
-    return devices
-
-# 测试数据
-test_output = """
-1484-7790-5200                            12      <1000    Onu1/0/1:1       WA6520H-EGPON/A  106/       Up        N/A
-1484-7790-4e20                            13      <1000    Onu1/0/1:2       WA6520H-EGPON/A  106/       Up        N/A
-1484-7790-3900                            N/A     N/A      Onu1/0/1:3       N/A             N/A        Offline   N/A
-"""
-
-result = parse_onu_status(test_output)
-print("解析结果:")
-for mac, status in result.items():
-    print(f"  {mac}: {status}")

backend/token_jwt_key.pem

@@ -1,28 +0,0 @@
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------END CERTIFICATE-----