🛡️ Sentinel: [HIGH] Fix Path Traversal and HTTP Parameter Pollution (HPP)

[belpythons]

🚨 Severity: HIGH
💡 Vulnerability: Dynamic user inputs (id, roadmapId, topicId, lessonId, query) were being concatenated directly into API endpoint URLs via template literals without being properly encoded.
🎯 Impact: This exposed the application to Path Traversal vulnerabilities (e.g., if an id contained ../) and HTTP Parameter Pollution (HPP) vulnerabilities (e.g., if a query contained &admin=true or other control characters), allowing malicious actors to manipulate API routing and backend logic.
🔧 Fix: Wrapped all dynamic input variables in src/services/apiService.js inside template literals with standard native encodeURIComponent(). This ensures that any special characters are safely escaped as data payloads rather than URL control structures.
✅ Verification: Ran pnpm run lint and pnpm run build to verify no syntactic regressions were introduced. Additionally, reviewed the apiService.js output locally to confirm successful mitigation across all endpoints.

Also added a journal entry in .jules/sentinel.md documenting this CRITICAL vulnerability pattern for future reference.

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PR created automatically by Jules for task 11519923785085224341 started by @belpythons

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