fix: 修复前端空白页与API调用错误，统一创作流程

- 前端
  - topics.html: 恢复结构并修复Vue初始化问题
  - 调整创作按钮逻辑：仅已发布选题禁用
  - 修正API端点与payload格式（generate/optimizer/publishing使用topic_ids数组）
  - 移除ElementPlus图标模块依赖，使用全局构建
  - admin.html: 回退至Options API版本，解决this上下文错误
- 后端
  - 注册/api/generate/run路由
  - 简化generate逻辑：允许非已发布选题重创作，更新状态为“待审查”
  - 统一logs查询接口支持query参数
  - 修复admin用户管理字段引用
  - 系统概览返回{ stats }结构
- 静态资源整理
  - 删除冗余element-plus-icons、重复CSS/JS、图标文件
  - 正确放置Vue和ElementPlus全局文件
- 数据库与数据
  - 补充30个案例
  - 更新选题状态与初始数据

验证：所有页面可访问，API认证与端点正常工作。

platform/backend/app/api/system.py

@@ -12,7 +12,8 @@ from ..models import Topic, Article
 from ..schemas import SystemStatus
 from ..core.generator import run_creator
 from ..core.optimizer import run_optimizer
-from ..core.sync import sync_topic_to_db, sync_all_topics
+from ..core.sync import sync_all_topics
+from ..core.scheduler import scheduler
 
 PROJECT_ROOT = Path(__file__).resolve().parents[4]
 if os.getenv('PROJECT_ROOT'):
@@ -151,3 +152,8 @@ def refresh_all():
         return {"message": "Refresh completed"}
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))
+
+@router.get("/scheduler/status", dependencies=[Depends(get_current_user)])
+def get_scheduler_status():
+    """获取定时任务状态"""
+    return {"jobs": scheduler.get_jobs()}

platform/backend/app/core/generator.py

@@ -6,7 +6,7 @@ import os
 logger = logging.getLogger(__name__)
 
 # 计算项目根目录（从本文件位置上升4层）
-PROJECT_ROOT = Path(__file__).resolve().parents[1]
+PROJECT_ROOT = Path(__file__).resolve().parents[4]
 # 允许环境变量覆盖（适合容器部署）
 if os.getenv('PROJECT_ROOT'):
     PROJECT_ROOT = Path(os.getenv('PROJECT_ROOT'))
@@ -18,7 +18,11 @@ def run_creator(topic_id: str = None):
         topic_id: 可选，指定要创作的选题ID。不指定则创作优先级最高的选题。
     """
     script_path = PROJECT_ROOT / "scripts" / "creator.py"
-    cmd = ["python3", str(script_path)]
+    venv_python = PROJECT_ROOT / "platform" / "backend" / "venv" / "bin" / "python"
+    if venv_python.exists():
+        cmd = [str(venv_python), str(script_path)]
+    else:
+        cmd = ["python3", str(script_path)]
     if topic_id:
         cmd.extend(["--topic-id", topic_id])
     result = subprocess.run(
@@ -47,7 +51,7 @@ def run_creator(topic_id: str = None):
         if "选题" in line and "已标记为「待发布」" in line:
             # 如: 2026-04-16 ... INFO - 选题 A01 已标记为「待发布」
             import re
-from .sync import sync_topic_to_db
+            from .sync import sync_topic_to_db
             m = re.search(r'选题\s+([A-Za-z0-9]+)', line)
             if m:
                 topic_id = m.group(1)

platform/backend/app/models.py

@@ -220,97 +220,3 @@ class SystemConfig(Base):
 
 
 # --- 新增模型：案例库 ---
-class Case(Base):
-    __tablename__ = "cases"
-
-    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    title = Column(String, nullable=False)
-    field = Column(String, nullable=False)  # 对应四大支柱及其子领域
-    summary = Column(Text, nullable=False)
-    key_metrics = Column(Text, nullable=True)  # 关键数据，JSON字符串或纯文本
-    date = Column(String, nullable=True)  # 年份或具体日期，如 "2024"
-    source = Column(String, nullable=False)
-    source_url = Column(String, nullable=True)
-    credibility_rating = Column(String, nullable=True)  # 如 "⭐⭐⭐"
-    china_applicability = Column(String, nullable=True)  # 如 "⭐⭐⭐⭐"
-    created_at = Column(DateTime(timezone=True), server_default=func.now())
-    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
-
-    def to_dict(self):
-        return {
-            "id": self.id,
-            "title": self.title,
-            "field": self.field,
-            "summary": self.summary,
-            "key_metrics": self.key_metrics,
-            "date": self.date,
-            "source": self.source,
-            "source_url": self.source_url,
-            "credibility_rating": self.credibility_rating,
-            "china_applicability": self.china_applicability,
-            "created_at": self.created_at.isoformat() if self.created_at else None,
-        }
-
-# --- 新增模型：任务日志 ---
-class TaskLog(Base):
-    __tablename__ = "task_logs"
-
-    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    task_name = Column(String, nullable=False)  # collector/creator/optimizer/research/outline/writer
-    topic_id = Column(String, nullable=True)  # 关联选题ID
-    status = Column(String, nullable=False)  # started/completed/failed
-    message = Column(Text, nullable=True)
-    started_at = Column(DateTime(timezone=True), nullable=False)
-    finished_at = Column(DateTime(timezone=True), nullable=True)
-    duration_seconds = Column(Integer, nullable=True)
-
-    def to_dict(self):
-        return {
-            "id": self.id,
-            "task_name": self.task_name,
-            "topic_id": self.topic_id,
-            "status": self.status,
-            "message": self.message,
-            "started_at": self.started_at.isoformat() if self.starthed_at else None,
-            "finished_at": self.finished_at.isoformat() if self.finished_at else None,
-            "duration_seconds": self.duration_seconds,
-        }
-
-# --- 新增模型：LLM 配置 ---
-class LLMConfig(Base):
-    __tablename__ = "llm_configs"
-
-    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    name = Column(String, unique=True, nullable=False)  # e.g., "default_expand"
-    system_prompt = Column(Text, nullable=False)
-    user_prompt_template = Column(Text, nullable=False)
-    temperature = Column(Float, default=0.7)
-    max_tokens = Column(Integer, default=1000)
-    model = Column(String, nullable=True)  # e.g., "stepfun-ai/step-3.5-flash"
-    is_active = Column(Boolean, default=True)
-    created_at = Column(DateTime(timezone=True), server_default=func.now())
-    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
-
-    def to_dict(self):
-        return {
-            "id": self.id,
-            "name": self.name,
-            "system_prompt": self.system_prompt,
-            "user_prompt_template": self.user_prompt_template,
-            "temperature": self.temperature,
-            "max_tokens": self.max_tokens,
-            "model": self.model,
-            "is_active": self.is_active,
-        }
-
-# --- 新增模型：系统配置（键值对） ---
-class SystemConfig(Base):
-    __tablename__ = "system_configs"
-
-    key = Column(String, primary_key=True)
-    value = Column(Text, nullable=True)  # JSON 字符串或普通文本
-    description = Column(String, nullable=True)
-    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
-
-    def to_dict(self):
-        return {"key": self.key, "value": self.value, "description": self.description}