feat(iit): Initialize IIT Manager Agent MVP - Day 1 complete

- Add iit_schema with 5 tables
- Create module structure and types (223 lines)
- WeChat integration verified (Access Token success)
- Update system docs to v2.4
- Add REDCap source folders to .gitignore
- Day 1/14 complete (11/11 tasks)

backend/scripts/check-dc-tables.mjs

@@ -219,6 +219,12 @@ checkDCTables();
 
 
 
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backend/scripts/create-tool-c-ai-history-table.mjs

@@ -171,6 +171,12 @@ createAiHistoryTable()
 
 
 
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backend/scripts/create-tool-c-table.js

@@ -158,6 +158,12 @@ createToolCTable()
 
 
 
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backend/scripts/create-tool-c-table.mjs

@@ -155,6 +155,12 @@ createToolCTable()
 
 
 
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