feat(quickstart): rename chatwithdoc to chatwitheino and add chapters 3-8
- Rename quickstart/chatwithdoc to quickstart/chatwitheino
- Update all import paths from chatwithdoc to chatwitheino
- Add chapter 3: Memory & Session (JSONL persistence)
- Add chapter 4: Tool & Backend (Filesystem access)
- Add chapter 5: Middleware
- Add chapter 6: Callback
- Add chapter 7: Interrupt & Resume
- Add chapter 8: Graph Tool
- Add chapter 9: A2UI documentation
- Update .gitignore to exclude *.jsonl and *.txt files
Change-Id: Iddeb4ad2bb2a3a1d192c335255dc86554b97e531
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shentong.martin