配置全面迁移数据库：PromptConfig、TaskConfig动态调度、敏感词/清洗规则/趋势映射/平台标签/痛点模板全部可编辑

- 新增 PromptConfig 模型 + API，支持提示词在线编辑（16条默认）
- 调度器动态读取 TaskConfig.schedule，admin 可调执行时间
- 新增 KeywordDomainMap、SensitiveWord、ContentCleanRule、TrendFieldMapping 表
- DOMAINS、TREND_DOMAIN_MAP、PLATFORM_TAGS、china_pains、RSS关键词、priority_weights 全部迁移到 DB
- tasks.html 重构：卡片网格+配置/产出/历史/提示词四个Tab，折叠显示
- 清理冗余代码：DEFAULT_PROMPTS死代码、collector.py unreachable代码、compliance_checker bug
- strip_thinking_html 改用 DB 规则优先

platform/backend/app/main.py

@@ -9,7 +9,7 @@ from pathlib import Path
 
 from .database import engine, get_db, init_db
 from .models import Base
-from .api import topics, system, articles, publishing, auth, admin, audit, optimizer_logs, cases, task_logs, llm_configs, system_configs, topic_config, calendar, metrics, assets, tasks, platform_config, collector_mgmt, assistant
+from .api import topics, system, articles, publishing, auth, admin, audit, optimizer_logs, cases, task_logs, task_configs, prompt_configs, llm_configs, system_configs, topic_config, calendar, metrics, assets, tasks, platform_config, collector_mgmt, assistant, config_items
 from .initial_data import import_initial_data
 from .core.scheduler import scheduler
 
@@ -83,6 +83,8 @@ app.include_router(admin.router)
 app.include_router(audit.router)
 app.include_router(optimizer_logs.router)
 app.include_router(cases.router)
+app.include_router(task_configs.router)
+app.include_router(prompt_configs.router)
 app.include_router(task_logs.router)
 app.include_router(llm_configs.router)
 app.include_router(system_configs.router)
@@ -94,6 +96,7 @@ app.include_router(tasks.router)
 app.include_router(platform_config.router)
 app.include_router(collector_mgmt.router)
 app.include_router(assistant.router)
+app.include_router(config_items.router)
 
 # 挂载自动生成的图片（必须先于前端根挂载）
 PROJECT_ROOT_DIR = Path(__file__).parent.parent.parent.parent