fix: Revert explicit REQUIRES mbedtls, move flood globals before NVS load

The main component in ESP-IDF auto-includes all components; explicit
REQUIRES overrides this and breaks the build. mbedtls is available
without it. Also moved flood detection globals above config_load_nvs
to fix undeclared identifier errors.

get-started/csi_recv_router/main/CMakeLists.txt

@@ -1,3 +1,2 @@
 idf_component_register(SRC_DIRS "."
-                       INCLUDE_DIRS "."
-                       REQUIRES mbedtls)
+                       INCLUDE_DIRS ".")