refactor(en): restructure en/documents to match zh structure
- Reorganize from 7 flat directories to 5 aggregated directories
- 00-fundamentals: core concepts, glue coding, methodology
- 01-getting-started: environment setup guides
- 02-methodology: tools, tutorials, development guides
- 03-practice: project examples (polymarket, telegram, fate-engine, etc.)
- 04-resources: templates, tools, external resources
- Remove duplicate files with underscore naming
- Add README.md for 00-fundamentals and 02-methodology
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