chore: 🧹 Remove unused apiKey placeholder

[Hardonian]

🎯 What: Removed the dead code apiKey: "unused" placeholder from the configuration generation script scripts/generate-openclaw-config.py, and removed all corresponding runtime and test assertions expecting this placeholder across src/lib/onboard.ts, test/e2e/test-messaging-compatible-endpoint.sh, test/generate-openclaw-config.test.ts, and test/onboard.test.ts.

💡 Why: This apiKey variable was an artificial non-secret placeholder ("unused") that served no functional purpose at runtime. Removing it cleans up dead code, reduces cognitive load, and eliminates unnecessary assertions in the provider initialization logic and test suites, improving overall code health and maintainability.

✅ Verification: Ran syntax validation on the modified bash script (bash -n test/e2e/test-messaging-compatible-endpoint.sh). Executed the unit test suite (pnpm test --project cli test/generate-openclaw-config.test.ts test/onboard.test.ts), and ensured repository-wide pre-commit hook checks (npm run check) successfully passed after discarding unrelated file changes. All functionality and tests behave as expected.

✨ Result: Improved maintainability by stripping out artificial dead code, simplifying the config generator, eliminating unnecessary config validation logic, and streamlining the dependent test suites.

Signed-off-by: Jules jules@example.com

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PR created automatically by Jules for task 3762892385845815847 started by @Hardonian

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