feat: Implement messaging functionality with conversation and chat screens, and enhance agent detail views.

lib/features/agents/data/agents_repository.dart

@@ -108,6 +108,93 @@ class AgentsRepository {
     }
   }
 
+  /// Get agent by ID: GET /agents/{id}
+  /// Response: { success, data: AgentProfile }
+  Future<AgentProfile> getAgentById(String id) async {
+    try {
+      final response = await _dio.get('${ApiConstants.agents}/$id');
+      final data = response.data['data'] as Map<String, dynamic>;
+      return AgentProfile.fromJson(data);
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to fetch agent',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// Get field values for agent: GET /agents/{id}/field-values
+  /// Response: { success, data: { agentProfileId, fieldValues: [...] } }
+  Future<List<AgentFieldValue>> getFieldValues(String agentId) async {
+    try {
+      final response =
+          await _dio.get('${ApiConstants.agents}/$agentId/field-values');
+      final data = response.data['data'] as Map<String, dynamic>;
+      final fieldValues = data['fieldValues'] as List<dynamic>? ?? [];
+      return fieldValues
+          .map((e) => AgentFieldValue.fromFieldValueResponse(
+              e as Map<String, dynamic>))
+          .toList();
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to fetch field values',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// Get testimonials for agent: GET /testimonials/agent/{agentProfileId}
+  Future<List<Map<String, dynamic>>> getTestimonials(String agentId,
+      {int limit = 10}) async {
+    try {
+      final response = await _dio.get(
+        '${ApiConstants.testimonials}/agent/$agentId',
+        queryParameters: {'limit': limit},
+      );
+      final data = response.data['data'] as List<dynamic>? ?? [];
+      return data.cast<Map<String, dynamic>>();
+    } on DioException catch (_) {
+      return [];
+    }
+  }
+
+  /// Get connection status: GET /connection-requests/status/{agentProfileId}
+  Future<Map<String, dynamic>?> getConnectionStatus(String agentId) async {
+    try {
+      final response = await _dio
+          .get('${ApiConstants.connectionRequests}/status/$agentId');
+      return response.data['data'] as Map<String, dynamic>?;
+    } on DioException catch (_) {
+      return null;
+    }
+  }
+
+  /// Create connection request: POST /connection-requests
+  Future<bool> createConnectionRequest(String agentId,
+      {String? message}) async {
+    try {
+      await _dio.post(ApiConstants.connectionRequests, data: {
+        'agentProfileId': agentId,
+        if (message != null && message.isNotEmpty) 'message': message,
+      });
+      return true;
+    } on DioException catch (_) {
+      return false;
+    }
+  }
+
+  /// Cancel connection request: DELETE /connection-requests/{requestId}
+  Future<bool> cancelConnectionRequest(String requestId) async {
+    try {
+      await _dio.delete('${ApiConstants.connectionRequests}/$requestId');
+      return true;
+    } on DioException catch (_) {
+      return false;
+    }
+  }
+
   /// Get agent types: GET /agent-types
   /// Response: { success, data: [...] }
   Future<List<AgentType>> getAgentTypes() async {