hotfix(dc/tool-c): Fix compute formula validation and binning NaN serialization

Critical fixes:
1. Compute column: Add Chinese comma support in formula validation
   - Problem: Formula with Chinese comma failed validation
   - Fix: Add Chinese comma character to allowed_chars regex
   - Example: Support formulas like 'col1（kg）+ col2，col3'

2. Binning operation: Fix NaN serialization error
   - Problem: 'Out of range float values are not JSON compliant: nan'
   - Fix: Enhanced NaN/inf handling in binning endpoint
   - Added np.inf/-np.inf replacement before JSON serialization
   - Added manual JSON serialization with NaN->null conversion

3. Enhanced all operation endpoints for consistency
   - Updated conditional, dropna endpoints with same NaN/inf handling
   - Ensures all operations return JSON-compliant data

Modified files:
- extraction_service/operations/compute.py: Add Chinese comma to regex
- extraction_service/main.py: Enhanced NaN handling in binning/conditional/dropna

Status: Hotfix complete, ready for testing

docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_AI_Few-shot示例库.md

@@ -530,3 +530,4 @@ df['creatinine'] = pd.to_numeric(df['creatinine'], errors='coerce')
 
 
 
+

docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_Bug修复总结_2025-12-08.md

@@ -368,3 +368,4 @@ npm run dev
 **修复完成时间**: 2025-12-08 当前时间  
 **状态**: ✅ 已完成，待测试验证
 
+

docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_Day3开发计划.md

@@ -945,3 +945,4 @@ export const aiController = new AIController();
 
 
 
+

docs/03-业务模块/DC-数据清洗整理/04-开发计划/工具C_Day4-5前端开发计划.md

@@ -1279,3 +1279,4 @@ npm install react-markdown
 
 
 
+