docs: restructure READMEs and add i18n documentation (#1729)
Restructure all 6 README files (en, zh, ja, fr, pt-br, vi) from
~1200-1580 lines down to ~250 lines each. Long sections (Chat Apps,
Providers, Configuration, Docker, Spawn Tasks, Troubleshooting, Tools)
are extracted into dedicated docs under docs/{lang}/ subdirectories.
Changes:
- Split README content into 7 sub-documents per language (42 new files)
- Update News section with v0.2.3/v0.2.1/v0.2.0/20K milestones
- Add 3 new Features (MCP Support, Vision Pipeline, Smart Routing)
- Complete CLI reference (14 commands, was 7)
- Fix Go badge 1.21+ -> 1.25+ (matches go.mod)
- Add LoongArch to architecture badge
- Fix Install section: hardcoded v0.1.1 -> latest/download URL
- Add Termux GitHub links
- Fix currency symbol placement ($599 not 599$)
- Add missing channels (Feishu, Slack, IRC, OneBot, MaixCam, Pico)
- Add missing providers (Kimi, Minimax, Avian, Mistral, Longcat, ModelScope)
- Add missing security docs (allow_read/write_paths, allow_remote, symlink)
- Remove incorrect azure from Providers table (azure uses model_list only)
- Cross-verified all claims against source code
Co-authored-by: BeaconCat <BeaconCat@users.noreply.github.com>
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