docs: publish bilingual TsGate 2.1.3 guides and release verification
docs: record successful 2.1.2 CI verification
docs: document 2.1.2 fixes and local verification
docs: document 2.1.1 fixes contracts and verified Docker CI
docs: simplify package guidance and remove reading conventions
Document TsGate 2.1.0, openGemini compatibility and namespace migration
docs: present current TsGate APIs and publication status
Publish bilingual TsGate documentation
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