Add OSS Index Base URL configuration field

[brianf]

Summary

Adds configurable Base URL field to the OSS Index analyzer admin UI, allowing users to point to alternative OSS Index API endpoints (e.g., https://api.guide.sonatype.com).

Changes

• Added Base URL input field to OSS Index analyzer configuration panel
• Field positioned between Alias Sync and Username fields
• Implements required field validation with lazy evaluation
• Uses existing translation key admin.base_url
• Property: scanner.ossindex.base.url (default: https://ossindex.sonatype.org)

Implementation Details

This implementation follows the established pattern from Snyk and Trivy analyzers for consistency:

• Uses b-validated-input-group-form-input component
• Validation: rules="required", lazy="true"
• Integrates with configPropertyMixin for API communication
• Reads from: GET /api/v1/configProperty/
• Writes to: POST /api/v1/configProperty/aggregate

Related PRs

This PR requires the backend changes from:

• Backend PR: Add configurable base URL for OSS Index API dependency-track#5736

Both PRs should be reviewed and merged together.

Testing

Manual testing required:

1. Navigate to Admin → Analyzers → OSS Index
2. Verify Base URL field appears between Alias Sync and Username
3. Test required field validation
4. Test saving custom URL (e.g., https://api.guide.sonatype.com)
5. Verify persistence after page refresh
6. Verify invalid URL handling

Files Changed

• src/views/administration/analyzers/OssIndexAnalyzer.vue - Added Base URL configuration field (4 changes: template, data, save, load)

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