Improve CrashDragon API Consistency, Auth Reliability, and Frontend Completion (Go + Vue.js)

CrashDragon plays a critical role in transforming VLC crash reports into actionable fixes, but current gaps in API consistency, auth-sensitive behavior, and frontend completeness introduce friction in triage and integration workflows. This project is a continuation of prior work and focuses on improving reliability without breaking existing functionality. The approach includes: Reviewing current API and frontend behavior to identify inconsistencies between public routes and /api/v1. Improving the Go backend by standardizing API response contracts, tightening validation, and hardening auth-sensitive mutation paths while preserving backward compatibility. Completing missing frontend surfaces and aligning Vue service-layer logic with typed API contracts to eliminate fragile response handling. The project will be delivered through incremental, review-driven changes with strong regression testing and CI validation to ensure stability. Deliverables: Consistent and well-defined /api/v1 API behavior with improved validation and error handling. Hardened authentication and mutation route reliability. Completed frontend views (stats, symfiles) with contract-aligned data handling. Expanded backend regression tests and improved documentation. Final implementation report and follow-up issue roadmap.