add ad services and Docker configuration for web app

lib/services/quote_api_v2.dart

@@ -170,7 +170,10 @@ class QuoteGeneratorApiV2 {
 
     final response = await http.post(
       url,
-      headers: {"Content-Type": "application/json"},
+      headers: {
+        "Content-Type": "application/json",
+        "User-Agent": "QuoteGen-Flutter/1.0",
+      },
       body: jsonEncode(request.toJson()),
     );
 
@@ -178,7 +181,7 @@ class QuoteGeneratorApiV2 {
       final data = jsonDecode(response.body);
       return QuoteSession.fromJson(data);
     } else {
-      throw Exception("Failed to create sesion: ${response.statusCode}");
+      throw Exception("Failed to create session: ${response.statusCode}");
     }
   }
 
@@ -187,7 +190,10 @@ class QuoteGeneratorApiV2 {
   static Future<QuoteSession> getSession(String sessionId) async {
     final url = Uri.parse("$_baseUrl/v2/quote/$sessionId");
 
-    final response = await http.get(url);
+    final response = await http.get(
+      url,
+      headers: {"User-Agent": "QuoteGen-Flutter/1.0"},
+    );
 
     if (response.statusCode == 200) {
       final data = jsonDecode(response.body);
@@ -206,7 +212,10 @@ class QuoteGeneratorApiV2 {
 
     final response = await http.patch(
       url,
-      headers: {"Content-Type": "application/json"},
+      headers: {
+        "Content-Type": "application/json",
+        "User-Agent": "QuoteGen-Flutter/1.0",
+      },
       body: jsonEncode(updates.toJson()),
     );
 
@@ -214,7 +223,7 @@ class QuoteGeneratorApiV2 {
       final data = jsonDecode(response.body);
       return QuoteSession.fromJson(data);
     } else {
-      throw Exception("Failed to updte session: ${response.statusCode}");
+      throw Exception("Failed to update session: ${response.statusCode}");
     }
   }
 
@@ -222,12 +231,15 @@ class QuoteGeneratorApiV2 {
   static Future<Uint8List> generateImage(String sessionId) async {
     final url = Uri.parse("$_baseUrl/v2/quote/$sessionId/image");
 
-    final response = await http.get(url);
+    final response = await http.get(
+      url,
+      headers: {"User-Agent": "QuoteGen-Flutter/1.0"},
+    );
 
     if (response.statusCode == 200) {
       return response.bodyBytes;
     } else {
-      throw Exception("Failed to genrate image: ${response.statusCode}");
+      throw Exception("Failed to generate image: ${response.statusCode}");
     }
   }
 
@@ -236,15 +248,18 @@ class QuoteGeneratorApiV2 {
   static Future<void> deleteSession(String sessionId) async {
     final url = Uri.parse("$_baseUrl/v2/quote/$sessionId");
 
-    final response = await http.delete(url);
+    final response = await http.delete(
+      url,
+      headers: {"User-Agent": "QuoteGen-Flutter/1.0"},
+    );
 
     if (response.statusCode != 204) {
-      throw Exception("Failed to delte session: ${response.statusCode}");
+      throw Exception("Failed to delete session: ${response.statusCode}");
     }
   }
 
 
-  // helper to get curren timestamp in seconds
+  // helper to get current timestamp in seconds
   static int getCurrentTimestamp() {
     return DateTime.now().millisecondsSinceEpoch ~/ 1000;
   }