fix(shell): allow default local API URL bootstrap

[skulidropek]

Summary

• Treat default-local DOCKER_GIT_API_URL values as bootstrap hints instead of strict remote controller overrides.
• Preserve strict failure behavior for custom explicit API URLs.
• Cover the Windows-like browser startup path in unit tests and browser e2e.

Context

Follow-up for PR #351. This fixes the case where a persisted Windows env var like DOCKER_GIT_API_URL=http://127.0.0.1:3334 prevents local Docker bootstrap.

Verification

• bun run --cwd packages/app typecheck
• bun run --cwd packages/app lint
• bun run --cwd packages/app lint:tests
• bun run --cwd packages/app lint:effect
• bun run --cwd packages/app vitest run tests/docker-git/controller.test.ts tests/docker-git/controller-ready.test.ts tests/docker-git/browser-frontend.test.ts
• DOCKER_GIT_E2E_REUSE_WORKSPACE_INSTALL=1 DOCKER_GIT_E2E_BROWSER_STARTUP_ATTEMPTS=360 bash scripts/e2e/browser-command.sh

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: d3a8e8a0-261b-427a-a556-df72241edc24

📥 Commits

Reviewing files that changed from the base of the PR and between 6850ded and db0594b.

📒 Files selected for processing (9)

• packages/api/README.md
• packages/app/src/docker-git/browser-frontend.ts
• packages/app/src/docker-git/controller-health.ts
• packages/app/src/docker-git/controller-reachability.ts
• packages/app/src/docker-git/controller.ts
• packages/app/tests/docker-git/browser-frontend.test.ts
• packages/app/tests/docker-git/controller-ready.test.ts
• packages/app/tests/docker-git/controller.test.ts
• scripts/e2e/browser-command.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/default-local-api-url-bootstrap-pr351

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