feat: sync httpdns sdk/platform updates without large binaries

HttpDNSSDK/sdk/ios/README.md

@@ -0,0 +1,58 @@
+# HTTPDNS iOS SDK (SNI Hidden v1.0.0)
+
+## 1. Init
+
+```objc
+#import <TrustHTTPDNS/TrustHTTPDNS.h>
+
+HttpdnsEdgeService *service = [[HttpdnsEdgeService alloc]
+    initWithAppId:@"app1f1ndpo9"
+primaryServiceHost:@"httpdns-a.example.com"
+ backupServiceHost:@"httpdns-b.example.com"
+        servicePort:443
+         signSecret:@"your-sign-secret"]; // optional if sign is enabled
+```
+
+## 2. Resolve
+
+```objc
+[service resolveHost:@"api.business.com" queryType:@"A" completion:^(HttpdnsEdgeResolveResult * _Nullable result, NSError * _Nullable error) {
+    if (error != nil) {
+        return;
+    }
+    NSLog(@"requestId=%@ ipv4=%@ ipv6=%@ ttl=%ld", result.requestId, result.ipv4s, result.ipv6s, (long)result.ttl);
+}];
+```
+
+## 3. Official Request Adapter (IP + Host)
+
+```objc
+NSURL *url = [NSURL URLWithString:@"https://api.business.com/v1/ping"];
+[service requestURL:url method:@"GET" headers:@{@"Accept": @"application/json"} body:nil completion:^(NSData * _Nullable data, NSHTTPURLResponse * _Nullable response, NSError * _Nullable error) {
+    if (error != nil) {
+        return;
+    }
+    NSLog(@"status=%ld", (long)response.statusCode);
+}];
+```
+
+Behavior is fixed:
+- Resolve by `/resolve`.
+- Connect to resolved IP over HTTPS.
+- Keep `Host` header as business domain.
+- No fallback to domain direct request.
+
+## 4. Public Errors
+
+- `NO_IP_AVAILABLE`
+- `TLS_EMPTY_SNI_FAILED`
+- `HOST_ROUTE_REJECTED`
+- `RESOLVE_SIGN_INVALID`
+
+## 5. Removed Public Params
+
+Do not expose legacy public parameters:
+- `accountId`
+- `serviceDomain`
+- `endpoint`
+- `aesSecretKey`