fix(server): fix doc_lazy_continuation clippy warnings

Add blank lines after first lines of doc comments to fix clippy
warnings about lazy continuation:
- Add blank line after '4. Hardcoded fallback (lowest priority)'
- Add blank line after 'Get a string value from Role.extra...'
- Add doc comment for resolve_llm_config function

Part of: #443

Author: AlexMikhalev

terraphim_server/src/workflows/multi_agent_handlers.rs

@@ -63,12 +63,13 @@ impl MultiAgentWorkflowExecutor {
     }
 
     /// Resolve LLM configuration from multiple sources with priority order:
-    ///
     /// 1. Request-level config (highest priority)
     /// 2. Role-level config from server config
     /// 3. Global defaults
     /// 4. Hardcoded fallback (lowest priority)
+    ///
     /// Get a string value from Role.extra, checking both flat and nested paths.
+    ///
     /// Due to `#[serde(flatten)]` on `Role.extra`, config JSON with `"extra": {"key": "val"}`
     /// results in `extra["extra"]["key"]` rather than `extra["key"]`.
     fn get_role_extra_str<'a>(
@@ -93,6 +94,12 @@ impl MultiAgentWorkflowExecutor {
         })
     }
 
+    /// Resolve LLM configuration from multiple sources with priority order:
+    ///
+    /// 1. Request-level config (highest priority)
+    /// 2. Role-level config from server config
+    /// 3. Global defaults
+    /// 4. Hardcoded fallback (lowest priority)
     fn resolve_llm_config(&self, request_config: Option<&LlmConfig>, role_name: &str) -> LlmConfig {
         let mut resolved = LlmConfig::default();
 
@@ -102,45 +109,31 @@ impl MultiAgentWorkflowExecutor {
                 // Check if there's a global LLM config section
                 let default_role_name = "Default".into();
                 if let Some(default_role) = config.roles.get(&default_role_name) {
-                    if let Some(provider) = default_role.extra.get("llm_provider") {
-                        if let Some(provider_str) = provider.as_str() {
-                            resolved.llm_provider = Some(provider_str.to_string());
-                        }
+                    if let Some(s) = Self::get_role_extra_str(&default_role.extra, "llm_provider") {
+                        resolved.llm_provider = Some(s.to_string());
                     }
-                    if let Some(model) = default_role.extra.get("llm_model") {
-                        if let Some(model_str) = model.as_str() {
-                            resolved.llm_model = Some(model_str.to_string());
-                        }
+                    if let Some(s) = Self::get_role_extra_str(&default_role.extra, "llm_model") {
+                        resolved.llm_model = Some(s.to_string());
                     }
-                    if let Some(base_url) = default_role.extra.get("llm_base_url") {
-                        if let Some(base_url_str) = base_url.as_str() {
-                            resolved.llm_base_url = Some(base_url_str.to_string());
-                        }
+                    if let Some(s) = Self::get_role_extra_str(&default_role.extra, "llm_base_url") {
+                        resolved.llm_base_url = Some(s.to_string());
                     }
                 }
 
                 // Check role-specific config
                 let role_name_key = role_name.into();
                 if let Some(role) = config.roles.get(&role_name_key) {
-                    if let Some(provider) = role.extra.get("llm_provider") {
-                        if let Some(provider_str) = provider.as_str() {
-                            resolved.llm_provider = Some(provider_str.to_string());
-                        }
+                    if let Some(s) = Self::get_role_extra_str(&role.extra, "llm_provider") {
+                        resolved.llm_provider = Some(s.to_string());
                     }
-                    if let Some(model) = role.extra.get("llm_model") {
-                        if let Some(model_str) = model.as_str() {
-                            resolved.llm_model = Some(model_str.to_string());
-                        }
+                    if let Some(s) = Self::get_role_extra_str(&role.extra, "llm_model") {
+                        resolved.llm_model = Some(s.to_string());
                     }
-                    if let Some(base_url) = role.extra.get("llm_base_url") {
-                        if let Some(base_url_str) = base_url.as_str() {
-                            resolved.llm_base_url = Some(base_url_str.to_string());
-                        }
+                    if let Some(s) = Self::get_role_extra_str(&role.extra, "llm_base_url") {
+                        resolved.llm_base_url = Some(s.to_string());
                     }
-                    if let Some(temp) = role.extra.get("llm_temperature") {
-                        if let Some(temp_val) = temp.as_f64() {
-                            resolved.llm_temperature = Some(temp_val);
-                        }
+                    if let Some(v) = Self::get_role_extra_f64(&role.extra, "llm_temperature") {
+                        resolved.llm_temperature = Some(v);
                     }
                 }
             }