🛡️ Sentinel: [CRITICAL] Fix Path Traversal and HPP vulnerabilities

[belpythons]

🚨 Severity: CRITICAL
💡 Vulnerability: The frontend API client (apiService.js) interpolated raw variables (like id, roadmapId, lessonId, and query) directly into URL paths and query strings using unescaped template literals without sanitization.
🎯 Impact: An attacker could perform HTTP Parameter Pollution (HPP) by injecting parameters or Path Traversal by inserting values like ../../ to manipulate backend API calls and potentially access unintended resources, bypassing standard client constraints.
🔧 Fix: Wrapped all dynamic input variables within src/services/apiService.js with encodeURIComponent().
✅ Verification: Ran unit format tests, built the application successfully (no new errors), and visually inspected git diff to ensure every parameter is safely encoded.

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PR created automatically by Jules for task 16287370813153678610 started by @belpythons

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