增加了提issue的功能

Signed-off-by: Chen Xiao <abigwc@gmail.com>

server/issue_db.py

@@ -0,0 +1,84 @@
+import json
+import time
+from datetime import datetime
+from pathlib import Path
+
+# Issue 数据存储在独立的 JSON 文件中
+ISSUES_PATH = Path(__file__).parent / "issues.json"
+
+def load_issues():
+    """加载所有 Issue 数据"""
+    if ISSUES_PATH.exists():
+        try:
+            with open(ISSUES_PATH, "r", encoding="utf-8") as f:
+                return json.load(f)
+        except Exception:
+            return []
+    return []
+
+def save_issues(issues: list):
+    """保存 Issue 数据到文件"""
+    with open(ISSUES_PATH, "w", encoding="utf-8") as f:
+        json.dump(issues, f, indent=2, ensure_ascii=False)
+
+def create_issue(user_id: int, username: str, title: str, issue_type: str, description: str, markdown_sample: str = ""):
+    """创建一条新 Issue"""
+    issues = load_issues()
+    new_issue = {
+        "id": int(time.time() * 1000),
+        "user_id": user_id,
+        "username": username,
+        "title": title,
+        "type": issue_type,
+        "description": description,
+        "markdown_sample": markdown_sample,
+        "status": "open",
+        "created_at": datetime.now().isoformat(),
+        "replies": []
+    }
+    # 插入到最前面（最新的在前）
+    issues.insert(0, new_issue)
+    save_issues(issues)
+    return new_issue
+
+def get_all_issues():
+    """获取所有 Issue（管理员用）"""
+    return load_issues()
+
+def get_user_issues(user_id: int):
+    """获取某用户提交的所有 Issue"""
+    issues = load_issues()
+    return [i for i in issues if i.get("user_id") == user_id]
+
+def get_issue_by_id(issue_id: int):
+    """根据 ID 获取单条 Issue"""
+    for i in load_issues():
+        if i.get("id") == issue_id:
+            return i
+    return None
+
+def add_reply(issue_id: int, author: str, content: str):
+    """给指定 Issue 添加一条回复"""
+    issues = load_issues()
+    for i in issues:
+        if i.get("id") == issue_id:
+            reply = {
+                "id": int(time.time() * 1000),
+                "author": author,
+                "content": content,
+                "created_at": datetime.now().isoformat()
+            }
+            i["replies"].append(reply)
+            save_issues(issues)
+            return reply
+    return None
+
+def update_issue_status(issue_id: int, status: str):
+    """更新 Issue 的状态（open / in_progress / closed）"""
+    issues = load_issues()
+    for i in issues:
+        if i.get("id") == issue_id:
+            i["status"] = status
+            save_issues(issues)
+            return i
+    return None