[READY FOR REVIEW]: Improvement/infra-defaults — centralise and auto-fill infrastructure configurations

[bharatsachya]

What changed

• Extracted infrastructure default handling logic (applyInfraDefaults) out of BootCommand.ts and into a new dedicated module, infraDefaults.ts.
• Expanded default configurations to auto-fill docker mode services (Mongo URI, Neo4j URI, Redis URL, and auto-generated Neo4j password).
• Updated applyInfraMode in infraMode.ts to seamlessly apply these defaults when switching between docker and embedded provider combinations.

Why

Default configurations were previously disjointed, with embedded mode defaults partially applied during mode selection and other defaults handled at boot. Centralising this logic ensures that switching to any infrastructure mode will automatically fill all required configuration parameters (URIs for Docker, file paths for Embedded) unless explicitly overridden. This simplifies setup and prevents startup issues caused by missing configuration keys.

How to test

1. Clear your existing bytebell configuration overrides for database and queue providers.
2. Run the CLI command to apply docker mode.
3. Verify that your configuration now contains the default URIs for Mongo, Neo4j, and Redis, along with a randomly generated Neo4j password.
4. Run the CLI command to apply embedded mode.
5. Verify the configuration is correctly updated with the default local file paths for SQLite, Ladybug, and Queue DB.
6. Verify the boot sequence runs correctly without missing configuration preflight errors.

• Branch name follows the naming rules above
• Title starts with a status tag
• Description has What / Why / How to test sections
• Screenshots attached (frontend PRs only)
• All CI checks pass (formatting, build, tests)
• Self-reviewed the diff — no leftover debug logs, commented-out code, or secrets
• Rebased against the target branch so the diff is clean

[ankitzm]

Case: fresh installation

firstly remove the checks when embedded is selected, secondly we decided to have default links in config for the same, so let's use that please