feat(rest): simplify web ui and prune non-core endpoints

components/control_plane/src/rest_server_common.c

@@ -1,8 +1,6 @@
 #include "rest_server_internal.h"
 
 #include <errno.h>
-#include <stdio.h>
-#include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -154,28 +152,6 @@ esp_err_t rest_server_base64_decode_alloc(const char *b64, uint8_t **out_raw, si
     return ESP_OK;
 }
 
-void rest_server_appendf(char *dst, size_t cap, size_t *offset, const char *fmt, ...) {
-    if (dst == NULL || cap == 0 || offset == NULL || fmt == NULL || *offset >= cap) {
-        return;
-    }
-
-    va_list ap;
-    va_start(ap, fmt);
-    int n = vsnprintf(dst + *offset, cap - *offset, fmt, ap);
-    va_end(ap);
-
-    if (n <= 0) {
-        return;
-    }
-
-    size_t written = (size_t)n;
-    if (written >= cap - *offset) {
-        *offset = cap - 1;
-        return;
-    }
-    *offset += written;
-}
-
 bool rest_server_json_bool_with_default(cJSON *item, bool default_value) {
     if (item == NULL) {
         return default_value;