Improve LLM provider configuration

test/core/llm/llm_config_test.dart

@@ -0,0 +1,49 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:relationship_saver/core/llm/llm_config.dart';
+
+void main() {
+  test('cloud provider defaults need an API key', () {
+    final LlmConfigState missingKey = LlmConfigState(
+      provider: LlmProvider.openai,
+    );
+    final LlmConfigState configured = LlmConfigState(
+      apiKeyConfigured: true,
+      provider: LlmProvider.openai,
+    );
+
+    expect(missingKey.isConfigured, isFalse);
+    expect(configured.isConfigured, isTrue);
+    expect(configured.baseUrl, 'https://api.openai.com/v1');
+    expect(configured.model, 'gpt-4o-mini');
+  });
+
+  test('local providers can be configured without an API key', () {
+    final LlmConfigState ollama = LlmConfigState(
+      provider: LlmProvider.ollama,
+      baseUrl: 'http://192.168.1.12:11434',
+      model: 'llama3.2:latest',
+    );
+    final LlmConfigState compatible = LlmConfigState(
+      provider: LlmProvider.openaiCompatible,
+      baseUrl: 'http://localhost:8000/v1',
+      model: 'local-model',
+    );
+
+    expect(ollama.isConfigured, isTrue);
+    expect(compatible.isConfigured, isTrue);
+  });
+
+  test('local providers still require a model and endpoint', () {
+    final LlmConfigState missingModel = LlmConfigState(
+      provider: LlmProvider.ollama,
+      baseUrl: 'http://localhost:11434',
+    );
+    final LlmConfigState missingEndpoint = LlmConfigState(
+      provider: LlmProvider.openaiCompatible,
+      model: 'local-model',
+    );
+
+    expect(missingModel.isConfigured, isFalse);
+    expect(missingEndpoint.isConfigured, isFalse);
+  });
+}