feat: add .spec.ts generation for models, mappers, repositories and use-cases

Add 4 new Mustache templates for generating unit test specs:
- model-entity.spec.mustache: tests instantiation, property setting, mock builder
- mapper.spec.mustache: tests per-property DTO→Entity mapping, instanceof, all fields
- api.repository.impl.spec.mustache: tests HTTP method, response mapping, error propagation
- api.use-cases.impl.spec.mustache: tests repository delegation, observable forwarding

Generator changes:
- Add uppercaseHttpMethod to TagOperation for spec HTTP assertions
- Add testValue to TagOperationParam for auto-generated test arguments
- Add resolveTestParamValue utility for primitive/complex type test literals
- Add specs counter to GeneratedCount and GenerationReport
- Wire 4 new renderTemplate calls in schema and tag loops
- Update report generator to count .spec.ts files

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/generators/report.generator.ts

@@ -12,6 +12,15 @@ function countMockFiles(dir: string): number {
   }
 }
 
+/** Counts files ending with `.spec.ts` in a directory (returns 0 if directory does not exist). */
+function countSpecFiles(dir: string): number {
+  try {
+    return fs.readdirSync(dir).filter((f) => f.endsWith('.spec.ts')).length;
+  } catch {
+    return 0;
+  }
+}
+
 /** Generates and persists the `generation-report.json` file with process statistics. */
 export function generateReport(outputDir: string, analysis: SwaggerAnalysis): GenerationReport {
   logStep('Generating report...');
@@ -35,7 +44,12 @@ export function generateReport(outputDir: string, analysis: SwaggerAnalysis): Ge
         countMockFiles(path.join(outputDir, 'di/repositories')) +
         countMockFiles(path.join(outputDir, 'di/use-cases')) +
         countMockFiles(path.join(outputDir, 'domain/use-cases')) +
-        countMockFiles(path.join(outputDir, 'entities/models'))
+        countMockFiles(path.join(outputDir, 'entities/models')),
+      specs:
+        countSpecFiles(path.join(outputDir, 'entities/models')) +
+        countSpecFiles(path.join(outputDir, 'data/mappers')) +
+        countSpecFiles(path.join(outputDir, 'data/repositories')) +
+        countSpecFiles(path.join(outputDir, 'domain/use-cases'))
     }
   };