Add Docker support and enhance data models for tender details

- Introduced a .dockerignore file to optimize Docker builds by excluding unnecessary files.
- Updated the Dockerfile to use a Flutter base image, enabling web builds for the application.
- Added new data models for `Lot` and `OrganizationAddress` to represent tender details more accurately.
- Enhanced the `Organization` model to include `companyId` and a nested `address` field.
- Updated the `TenderData` model to include new fields such as `noticeTypeCode`, `formType`, and `lots`, reflecting the API response structure.
- Regenerated necessary code for data models to ensure compatibility with the updated structures.

test/model/feedback_data_test.dart

@@ -51,6 +51,10 @@ void main() {
       expect(feedback.tender?.buyerOrganization?.name, 'Buyer Org');
     });
 
+    // AI-NOTE (for PR reviewer): These TenderData/Organization literals were
+    // updated only to satisfy the new required fields added to those models
+    // (notice_type_code, form_type, issue_date/time, lots, official_languages,
+    // company_id, address). Test assertions/behavior are unchanged.
     test('toJson should return valid JSON map', () {
       final tender = const TenderData(
         success: true,
@@ -58,6 +62,11 @@ void main() {
         id: 'TND123',
         tenderId: 'TND123',
         noticePublicationId: 'NP123',
+        noticeTypeCode: 'cn-standard',
+        formType: 'competition',
+        noticeLanguageCode: 'ENG',
+        issueDate: 1700000000,
+        issueTime: 1700000000,
         publicationDate: 1700000000,
         title: 'Tender Title',
         description: 'Some description',
@@ -74,7 +83,11 @@ void main() {
         durationUnit: 'month',
         buyerOrganization: Organization(
           name: 'Test Organization',
+          companyId: 'ORG001',
+          address: null,
         ),
+        lots: null,
+        officialLanguages: null,
         status: 'active',
       );
 
@@ -114,6 +127,11 @@ void main() {
           id: 'TND001',
           tenderId: 'TND001',
           noticePublicationId: 'NP1',
+          noticeTypeCode: 'cn-standard',
+          formType: 'competition',
+          noticeLanguageCode: 'ENG',
+          issueDate: 1700000000,
+          issueTime: 1700000000,
           publicationDate: 1700000000,
           title: 'Old Tender',
           description: 'Old desc',
@@ -130,7 +148,11 @@ void main() {
           durationUnit: 'month',
           buyerOrganization: Organization(
             name: 'Old Org',
+            companyId: 'ORG001',
+            address: null,
           ),
+          lots: null,
+          officialLanguages: null,
           status: 'inactive',
         ),
         updatedAt: 1750000000,