feat: Introduce core configuration management with an example file and a provider factory.

config/config.example.json

@@ -46,6 +46,14 @@
       "model": "openai/gpt-5.2",
       "api_key": "sk-key2",
       "api_base": "https://api2.example.com/v1"
+    },
+    {
+      "_comment": "Cloudflare AI example: use 'provider' field when model name contains special characters like @cf/",
+      "model_name": "cf_qwen",
+      "model": "@cf/qwen/qwen3-30b-a3b-fp8",
+      "provider": "own",
+      "api_key": "YOUR_CLOUDFLARE_API_TOKEN",
+      "api_base": "https://api.cloudflare.com/client/v4/accounts/[YOUR_ACCOUNT_ID]/ai/v1"
     }
   ],
   "channels": {

pkg/config/config.go

@@ -501,10 +501,16 @@ type OpenAIProviderConfig struct {
 // The model field uses protocol prefix format: [protocol/]model-identifier
 // Supported protocols: openai, anthropic, antigravity, claude-cli, codex-cli, github-copilot
 // Default protocol is "openai" if no prefix is specified.
+//
+// The optional Provider field explicitly sets the protocol/provider, overriding the
+// prefix parsed from the Model field. This is useful when the model identifier
+// itself contains slashes that would be misinterpreted as a protocol prefix
+// (e.g. Cloudflare AI models like "@cf/qwen/qwen3-30b-a3b-fp8").
 type ModelConfig struct {
 	// Required fields
 	ModelName string `json:"model_name"`          // User-facing alias for the model
-	Model     string `json:"model"`      // Protocol/model-identifier (e.g., "openai/gpt-4o", "anthropic/claude-sonnet-4.6")
+	Model     string `json:"model"`               // Model identifier, optionally prefixed with protocol (e.g., "openai/gpt-4o")
+	Provider  string `json:"provider,omitempty"` // Explicit protocol/provider override (e.g., "openai", "anthropic", "cloudflare", "own")
 
 	// HTTP-based providers
 	APIBase string `json:"api_base,omitempty"` // API endpoint URL

pkg/providers/factory_provider.go

@@ -42,6 +42,10 @@ func createCodexAuthProvider() (LLMProvider, error) {
 //   - "openai/gpt-4o" -> ("openai", "gpt-4o")
 //   - "anthropic/claude-sonnet-4.6" -> ("anthropic", "claude-sonnet-4.6")
 //   - "gpt-4o" -> ("openai", "gpt-4o")  // default protocol
+//
+// Note: use CreateProviderFromConfig when a ModelConfig is available, as it
+// respects the explicit Provider override field (needed for models whose
+// identifiers contain slashes, e.g. Cloudflare "@cf/qwen/qwen3-30b-a3b-fp8").
 func ExtractProtocol(model string) (protocol, modelID string) {
 	model = strings.TrimSpace(model)
 	protocol, modelID, found := strings.Cut(model, "/")
@@ -64,7 +68,17 @@ func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, err
 		return nil, "", fmt.Errorf("model is required")
 	}
 
-	protocol, modelID := ExtractProtocol(cfg.Model)
+	// If Provider is explicitly set, use it as the protocol and treat the entire
+	// Model string as the model identifier (no prefix stripping). This handles
+	// models whose names contain slashes that would otherwise be misinterpreted
+	// as a protocol prefix (e.g. Cloudflare AI: "@cf/qwen/qwen3-30b-a3b-fp8").
+	var protocol, modelID string
+	if cfg.Provider != "" {
+		protocol = strings.ToLower(strings.TrimSpace(cfg.Provider))
+		modelID = cfg.Model
+	} else {
+		protocol, modelID = ExtractProtocol(cfg.Model)
+	}
 
 	switch protocol {
 	case "openai":