Move optimization files to /src/auth/ for consistency (#130)

- Move mcp_c_auth_api_crypto_optimized.cc to src/auth/mcp_auth_crypto_optimized.cc
- Move mcp_c_auth_api_network_optimized.cc to src/auth/mcp_auth_network_optimized.cc
- Update CMakeLists.txt to reference new locations
- Complete reorganization of all auth-related code to src/auth/ directory

Author: RahulHere

…c_api/mcp_c_auth_api_crypto_optimized.cc src/auth/mcp_auth_crypto_optimized.ccsrc/c_api/mcp_c_auth_api_crypto_optimized.cc renamed to src/auth/mcp_auth_crypto_optimized.cc src/c_api/mcp_c_auth_api_crypto_optimized.cc renamed to src/auth/mcp_auth_crypto_optimized.cc

@@ -37,8 +37,8 @@ set(MCP_C_API_SOURCES
 
     # Authentication API (moved to src/auth for better organization)
     ../auth/mcp_auth_implementation.cc  # JWT validation and OAuth support
-    mcp_c_auth_api_crypto_optimized.cc  # Optimized cryptographic operations
-    mcp_c_auth_api_network_optimized.cc # Optimized network operations
+    ../auth/mcp_auth_crypto_optimized.cc  # Optimized cryptographic operations
+    ../auth/mcp_auth_network_optimized.cc # Optimized network operations
 
     # TODO: Update these to use new opaque handle API
     mcp_c_api_json.cc  # JSON conversion functions