🏗️ Provider Configuration Foundation

🎯 Foundation Features:
- ProviderType enum (Local, OpenRouter)
- ProviderConfig with validation status tracking
- Settings extension with provider management
- SettingsAction enum for provider operations
- Secure API key masking and validation

📋 Data Structures:
- ValidationStatus: Unchecked → Checking → Valid/Invalid
- ProviderField: LocalEndpoint, OpenRouterApiKey
- Provider navigation and field focus management
- Clean separation between LOCAL and OPENROUTER configs

🔒 Security Features:
- API key masking (show first 10 + last 3 chars)
- Input validation for URLs and keys
- Required field validation
- Extensible validation architecture

🧪 Testing:
- 10/10 tests passing ✅
- Provider config creation & updates ✅
- API key masking ✅
- Validation rules ✅
- Navigation & field management ✅
- Demo example working ✅

🚀 Ready for UI Integration:
- Foundation supports async validation
- Clean action-based architecture
- Extensible for future providers
- Security-first design

Closes #29

Author: gitcoder89431

examples/issue_29_demo.rs

@@ -0,0 +1,114 @@
+//! Issue #29 Demo: Provider Configuration Foundation
+//!
+//! Demonstrates the new provider configuration system for LOCAL and OPENROUTER providers.
+
+use agentic::{
+    settings::{
+        Settings, SettingsAction, ProviderConfig, ProviderField, 
+        ValidationStatus
+    },
+};
+
+fn main() {
+    println!("🏗️ Issue #29 Demo: Provider Configuration Foundation");
+    println!("==================================================");
+
+    println!("\n✅ Provider Configuration Foundation Features:");
+
+    // 1. Create settings with provider configurations
+    println!("1. Creating settings with default provider configurations...");
+    let mut settings = Settings::new();
+    
+    println!("   Local provider configured: {}", settings.local_provider.is_configured());
+    println!("   OpenRouter provider configured: {}", settings.openrouter_provider.is_configured());
+    println!("   Selected provider: {}", settings.get_provider_name(settings.selected_provider_index));
+
+    // 2. Test provider type creation
+    println!("\n2. Testing provider configuration types...");
+    let local_config = ProviderConfig::new_local();
+    let openrouter_config = ProviderConfig::new_openrouter();
+    
+    println!("   Local default endpoint: {:?}", local_config.endpoint_url);
+    println!("   Local API key: {:?}", local_config.api_key);
+    println!("   OpenRouter endpoint: {:?}", openrouter_config.endpoint_url);
+    println!("   OpenRouter API key: {:?}", openrouter_config.api_key);
+
+    // 3. Test validation status system
+    println!("\n3. Testing validation status system...");
+    for status in [
+        ValidationStatus::Unchecked,
+        ValidationStatus::Checking, 
+        ValidationStatus::Valid,
+        ValidationStatus::Invalid
+    ] {
+        println!("   Status: {:?} → Icon: {}", status, Settings::get_validation_status_icon(&status));
+    }
+
+    // 4. Test field updates
+    println!("\n4. Testing field update actions...");
+    settings.handle_action(SettingsAction::UpdateField(
+        ProviderField::LocalEndpoint,
+        "http://localhost:8080".to_string()
+    ));
+    println!("   Updated local endpoint: {:?}", settings.local_provider.endpoint_url);
+
+    settings.handle_action(SettingsAction::UpdateField(
+        ProviderField::OpenRouterApiKey,
+        "sk-or-demo123456789012345".to_string()
+    ));
+    println!("   Updated OpenRouter API key: {:?}", settings.openrouter_provider.api_key);
+    println!("   Masked API key display: {:?}", settings.openrouter_provider.get_masked_api_key());
+
+    // 5. Test provider navigation
+    println!("\n5. Testing provider navigation...");
+    println!("   Current provider index: {}", settings.selected_provider_index);
+    settings.handle_action(SettingsAction::NavigateProviderNext);
+    println!("   After next: {} ({})", settings.selected_provider_index, 
+             settings.get_provider_name(settings.selected_provider_index));
+    settings.handle_action(SettingsAction::NavigateProviderNext);
+    println!("   After next (wrap): {} ({})", settings.selected_provider_index,
+             settings.get_provider_name(settings.selected_provider_index));
+
+    // 6. Test validation
+    println!("\n6. Testing configuration validation...");
+    match settings.validate() {
+        Ok(()) => println!("   ✅ Configuration is valid"),
+        Err(e) => println!("   ❌ Configuration error: {}", e),
+    }
+
+    // Test with invalid configuration
+    let mut invalid_settings = Settings::new();
+    invalid_settings.local_provider.endpoint_url = None;
+    invalid_settings.openrouter_provider.api_key = None;
+    match invalid_settings.validate() {
+        Ok(()) => println!("   ❌ Should have failed validation"),
+        Err(e) => println!("   ✅ Correctly caught error: {}", e),
+    }
+
+    // 7. Test security features
+    println!("\n7. Testing security features...");
+    let mut secure_config = ProviderConfig::new_openrouter();
+    secure_config.set_api_key("sk-or-very-long-secret-key-12345".to_string());
+    println!("   Full key: {:?}", secure_config.api_key);
+    println!("   Masked display: {:?}", secure_config.get_masked_api_key());
+
+    println!("\n🎯 Success Criteria Verification:");
+    println!("✅ Provider configuration data structures defined");
+    println!("✅ Validation status management system ready");
+    println!("✅ Settings actions support provider operations");
+    println!("✅ Clean separation between LOCAL and OPENROUTER configs");
+    println!("✅ Extensible architecture for future providers");
+    println!("✅ Secure handling of sensitive data (API keys)");
+
+    println!("\n🎨 Provider Configuration Workflow:");
+    println!("• Settings contains both Local and OpenRouter providers");
+    println!("• Each provider tracks validation status independently");
+    println!("• API keys are masked for security in UI display");
+    println!("• Configuration validation ensures at least one provider");
+    println!("• Field focus management for input handling");
+    println!("• Non-blocking async validation architecture ready");
+
+    println!("\n🚀 Issue #29 Provider Configuration Foundation: COMPLETE!");
+    println!("   The foundation is ready for backend communication settings");
+    println!("   and extensible for future provider types!");
+}