docs: overhaul docs IA and multilingual navigation

docs/getting-started/README.md

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+# Getting Started Docs
+
+For first-time setup and quick orientation.
+
+## Start Path
+
+1. Main overview and quick start: [../../README.md](../../README.md)
+2. One-click setup and dual bootstrap mode: [../one-click-bootstrap.md](../one-click-bootstrap.md)
+3. Find commands by tasks: [../commands-reference.md](../commands-reference.md)
+
+## Onboarding and Validation
+
+- Quick onboarding: `zeroclaw onboard --api-key "sk-..." --provider openrouter`
+- Interactive onboarding: `zeroclaw onboard --interactive`
+- Validate environment: `zeroclaw status` + `zeroclaw doctor`
+
+## Next
+
+- Runtime operations: [../operations/README.md](../operations/README.md)
+- Reference catalogs: [../reference/README.md](../reference/README.md)