Restructure repository: Remove OWASP categorization, organize by vulnerability type

Co-authored-by: Stalin-143 <161853795+Stalin-143@users.noreply.github.com>

Authentication-Bypass/README.md

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+# Authentication Bypass
+
+## Description
+Authentication bypass vulnerabilities allow an attacker to gain access to a system without providing valid credentials. These vulnerabilities can result from flawed authentication logic, improper session management, or weak authentication mechanisms.
+
+## Common Attack Vectors
+- Login forms
+- Password reset functionality
+- Multi-factor authentication
+- Session tokens
+- JWT tokens
+- OAuth flows
+
+## Testing Approach
+Test authentication mechanisms for logical flaws, parameter manipulation, and bypass techniques that allow unauthorized access.
+
+## Payloads
+See `auth-bypass-payloads.txt` for a comprehensive list of authentication bypass payloads and techniques.