refactor: restructure cursor rules with new meta-rule architecture

- Remove legacy rule files (documentation.mdc, general_development.mdc, etc.)
- Implement new meta-rule system with core, app, and feature categories
- Add meta-rule files for different workflows (bug diagnosis, feature planning, etc.)
- Create organized directory structure: core/, app/, features/, database/, etc.
- Add comprehensive README.md for rules documentation
- Establish new rule architecture with always-on and workflow-specific rules

This restructuring improves rule organization, enables better workflow management,
and provides clearer separation of concerns for different development tasks.

.cursor/rules/development/development_guide.mdc

@@ -0,0 +1,33 @@
+---
+globs: **/src/**/*
+alwaysApply: false
+---
+✅ use system date command to timestamp all interactions with accurate date and
+  time
+✅ python script files must always have a blank line at their end
+✅ remove whitespace at the end of lines
+✅ use npm run lint-fix to check for warnings
+✅ do not use npm run dev let me handle running and supplying feedback
+
+## Model Implementation Checklist
+
+### Before Development Work
+
+- [ ] **System Date Check**: Use system date command for accurate timestamps
+- [ ] **Environment Setup**: Verify development environment is ready
+- [ ] **Linting Setup**: Ensure npm run lint-fix is available
+- [ ] **Code Standards**: Review project coding standards and requirements
+
+### During Development
+
+- [ ] **Timestamp Usage**: Include accurate timestamps in all interactions
+- [ ] **Code Quality**: Use npm run lint-fix to check for warnings
+- [ ] **File Standards**: Ensure Python files have blank line at end
+- [ ] **Whitespace**: Remove trailing whitespace from all lines
+
+### After Development
+
+- [ ] **Linting Check**: Run npm run lint-fix to verify code quality
+- [ ] **File Validation**: Confirm Python files end with blank line
+- [ ] **Whitespace Review**: Verify no trailing whitespace remains
+- [ ] **Documentation**: Update relevant documentation with changes