docs: reorganize and update all documentation to reflect production readiness

- Move all documentation to docs/ directory for better organization
- Update ANALYSIS.md with current production status and resolved issues
- Completely rewrite IMPLEMENTATION_COMPARISON.md with feature parity matrix
- Update TODO.md to reflect completed milestones and future roadmap
- Create comprehensive docs/README.md as documentation index
- Update main README.md with project status and documentation links
- All documentation now reflects August 2025 production-ready status
- Both implementations verified as feature-complete with identical output

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/examples/sample-sync-metadata.json

@@ -0,0 +1,10 @@
+{
+  "_id": "sync_metadata_INBOX",
+  "_rev": "2-def456abc789123",
+  "docType": "sync_metadata",
+  "mailbox": "INBOX",
+  "lastSyncTime": "2025-08-02T14:26:08.281094+02:00",
+  "lastMessageUID": 123,
+  "messageCount": 45,
+  "updatedAt": "2025-08-02T14:26:08.281094+02:00"
+}