feat(licensedb): Add conflict resolution module for data synchronization

[ADITYA-CODE-SOURCE]

Summary

Add conflict resolution module for LicenseDB data synchronization as part of GSoC 2026 project. This module handles conflicts that may arise when synchronizing license and obligation data from LicenseDB.

Changes

File	Description
ResolutionStrategy.java	Enum: REPLACE, SKIP, MERGE, MANUAL
ConflictResult.java	Result container for resolution decisions
ConflictConfig.java	Configuration properties for default strategies
ConflictResolver.java	Interface for conflict resolution
LicenseConflictResolver.java	License-specific conflict resolution
ObligationConflictResolver.java	Obligation-specific conflict resolution

Resolution Strategies

Strategy	Description
REPLACE	Overwrite local data with LicenseDB data
SKIP	Keep local data, ignore LicenseDB updates
MERGE	Combine data (prefer non-null values)
MANUAL	Flag for manual administrator review

Configuration

licensedb:
  conflict-resolution:
    default-license-strategy: REPLACE
    default-obligation-strategy: REPLACE
    audit-enabled: true
    audit-log-path: logs/license-db-conflicts.log

Usage

@Autowired
private LicenseConflictResolver licenseConflictResolver;

public void syncLicense(License incoming) {
    License existing = licenseService.getLicenseByShortname(incoming.getShortname());
    ConflictResult<License> result = licenseConflictResolver.resolve(
        incoming, 
        existing, 
        ResolutionStrategy.REPLACE
    );
    
    if (result.isRequiresManualReview()) {
        // Queue for manual review
    }
}

Testing

• Files compile without errors
• Follows SW360 code style
• EPL-2.0 license headers included
• No new dependencies

Dependencies

• Depends on: PR feat(config): Add LicenseDB connection configuration properties #3686 (LicenseDB configuration)
• Related: PR feat(licensedb): Add data transformation layer for LicenseDB integration #3898 (Data transformation layer)

Related

Fixes #3899

Part of: GSoC 2026: Integration of SW360 and LicenseDB