feat(handlers): add duplicate login check and improve request handling

refactor: move postLog package to root directory and enhance logging
fix(frpc): improve request parsing and type handling for instance creation
chore: update config paths and enable debug mode

configs/superfrpc_test_test123.toml

@@ -0,0 +1,5 @@
+[common]
+server_addr = 127.0.0.1
+server_port = 7000
+auth_method = token
+ =