feat(ai): add support for Ollama AI provider configuration

* Update README with Ollama integration details
* Add Ollama configuration to example YAML files
* Implement Ollama provider in AI factory
* Add tests for Ollama provider functionality
* Enhance config validation for Ollama settings

internal/ai/factory_test.go

@@ -0,0 +1,33 @@
+package ai
+
+import (
+	"io"
+	"log/slog"
+	"net/http"
+	"testing"
+
+	"git.warky.dev/wdevs/amcs/internal/config"
+)
+
+func TestNewProviderSupportsOllama(t *testing.T) {
+	provider, err := NewProvider(config.AIConfig{
+		Provider: "ollama",
+		Embeddings: config.AIEmbeddingConfig{
+			Model:      "nomic-embed-text",
+			Dimensions: 768,
+		},
+		Metadata: config.AIMetadataConfig{
+			Model: "llama3.2",
+		},
+		Ollama: config.OllamaConfig{
+			BaseURL: "http://localhost:11434/v1",
+			APIKey:  "ollama",
+		},
+	}, &http.Client{}, slog.New(slog.NewTextHandler(io.Discard, nil)))
+	if err != nil {
+		t.Fatalf("NewProvider() error = %v", err)
+	}
+	if provider.Name() != "ollama" {
+		t.Fatalf("provider name = %q, want ollama", provider.Name())
+	}
+}