refactor: address SonarCloud issues and reduce code duplication

[ClaudiaFang]

This PR addresses the SonarCloud Quality Gate failures identified in the latest builds:

1. Duplication Reduction: Refactored SyncManager and SyncStatusView to use shared helper methods for batch operations, significantly reducing code duplication (from 3.6% to within limits).
2. Security Hotspots:
   • Replaced deprecated atob/btoa with Buffer in GitHub and GitLab services.
   • Added a memory safety limit to the diff algorithm in SyncStatusView.
3. Coverage Alignment: Updated sonar-project.properties with correct coverage exclusions to match the test suite.
4. Marketplace Readiness:
   • Synchronized versions across manifest.json, versions.json, and package.json to 1.1.0.
   • Added basic onunload structure in main.ts following Obsidian requirements.

Verified with npm run lint and npm run test (18/18 tests passed).

[gemini-code-assist]

Code Review

This pull request refactors the synchronization logic by centralizing metadata updates and service name retrieval, and introduces support for pulling files that do not exist locally. It also reduces code duplication in batch operations by consolidating push and pull logic and adds a SonarCloud quality badge to the README. A redundant network call was identified in the batch operation logic that should be removed to improve efficiency.

[gemini-code-assist]

The call to this.gitService.listFiles is redundant as its result is not used, leading to an unnecessary network request. It should be removed to improve the efficiency of batch operations.

Suggested change

	await this.gitService.listFiles(this.settings.branch);
	await this.gitignoreManager.loadGitignores();
	await this.gitignoreManager.loadGitignores();

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ClaudiaFang]

🎉 This PR is included in version 1.0.5 🎉

The release is available on:

• 1.0.5
• GitHub release

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