fix(cli): wire config.toml into backend creation

config.toml was defined but never read at startup. Now the CLI:
1. Loads ~/.config/crab-code/config.toml
2. Merges with priority: CLI args > settings.json > config.toml
3. Provider/model/api_key/api_base_url all resolved correctly

This enables DeepSeek/OpenAI/Ollama via config.toml profiles.

Author: lingcoder

crates/cli/src/main.rs

@@ -574,23 +574,32 @@ async fn run(cli: &Cli, resume_session_id: Option<String>) -> anyhow::Result<()>
         }
     }
 
-    // CLI args override settings; non-default CLI provider overrides settings
-    let provider = if cli.provider == "anthropic" {
-        settings
-            .api_provider
-            .clone()
-            .unwrap_or_else(|| cli.provider.clone())
-    } else {
+    // Load config.toml for multi-provider support
+    let config_toml = crab_config::config_toml::load_config_toml().unwrap_or_default();
+    let provider_override = (cli.provider != "anthropic").then_some(cli.provider.as_str());
+    let toml_settings =
+        crab_config::config_toml::config_toml_to_settings(&config_toml, provider_override);
+
+    // Merge priority: CLI args > settings.json > config.toml > defaults
+    let provider = if cli.provider != "anthropic" {
         cli.provider.clone()
+    } else if let Some(ref p) = settings.api_provider {
+        p.clone()
+    } else if let Some(ref p) = toml_settings.api_provider {
+        p.clone()
+    } else {
+        "anthropic".to_string()
     };
+
     let model_id = cli
         .model
         .as_deref()
         .map(resolve_model_alias)
         .or_else(|| settings.model.clone())
+        .or_else(|| toml_settings.model.clone())
         .unwrap_or_else(|| {
-            if provider == "openai" {
-                "gpt-4o".to_string()
+            if provider == "openai" || provider == "deepseek" || provider == "ollama" {
+                "deepseek-chat".to_string()
             } else {
                 "claude-sonnet-4-6".to_string()
             }
@@ -599,8 +608,14 @@ async fn run(cli: &Cli, resume_session_id: Option<String>) -> anyhow::Result<()>
     // Build effective settings for backend creation
     let effective_settings = crab_config::Settings {
         api_provider: Some(provider.clone()),
-        api_base_url: settings.api_base_url.clone(),
-        api_key: settings.api_key.clone(),
+        api_base_url: settings
+            .api_base_url
+            .clone()
+            .or_else(|| toml_settings.api_base_url.clone()),
+        api_key: settings
+            .api_key
+            .clone()
+            .or_else(|| toml_settings.api_key.clone()),
         model: Some(model_id.clone()),
         ..settings.clone()
     };