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.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 
 	"git.warky.dev/wdevs/amcs/internal/ai/litellm"
+	"git.warky.dev/wdevs/amcs/internal/ai/ollama"
 	"git.warky.dev/wdevs/amcs/internal/ai/openrouter"
 	"git.warky.dev/wdevs/amcs/internal/config"
 )
@@ -14,6 +15,8 @@ func NewProvider(cfg config.AIConfig, httpClient *http.Client, log *slog.Logger)
 	switch cfg.Provider {
 	case "litellm":
 		return litellm.New(cfg, httpClient, log)
+	case "ollama":
+		return ollama.New(cfg, httpClient, log)
 	case "openrouter":
 		return openrouter.New(cfg, httpClient, log)
 	default: