🏗️ Provider Configuration Foundation

[gitcoder89431]

🏗️ Provider Configuration Foundation

Establishes the core architecture for managing LOCAL and OPENROUTER provider configurations with validation states and secure storage.

✅ Core Foundation Features

Provider Configuration Types:

pub enum ProviderType { Local, OpenRouter }
pub struct ProviderConfig {
    pub provider_type: ProviderType,
    pub endpoint_url: Option<String>,  // For LOCAL
    pub api_key: Option<String>,       // For OPENROUTER  
    pub validation_status: ValidationStatus,
}

Validation System:

• ValidationStatus: Unchecked → Checking → Valid ✅ / Invalid ❌
• Visual status icons: ⚪🟡✅❌
• Async validation architecture ready

Settings Extension:

• Extended Settings struct with local_provider and openrouter_provider
• Provider navigation with selected_provider_index
• Field focus management with focused_field: Option<ProviderField>

🔒 Security Features

• API Key Masking: sk-or-1234567890...345 (first 10 + last 3 chars)
• Input Validation: URL format validation for local endpoints
• Required Fields: At least one provider must be configured
• Secure Storage: Architecture ready for encrypted persistence

🎯 Action System

Extended SettingsAction with provider operations:

pub enum SettingsAction {
    // Theme actions
    ChangeTheme(ThemeVariant),
    NavigateThemePrevious,
    NavigateThemeNext,
    
    // Provider actions  
    NavigateProviderPrevious,
    NavigateProviderNext,
    FocusField(ProviderField),
    UpdateField(ProviderField, String),
    ValidateProvider(ProviderType),
    SaveConfiguration,
}

🧪 Quality Assurance

• Testing: 10/10 tests passing ✅

  • Provider config creation & updates
  • API key masking functionality
  • Validation rules and error handling
  • Navigation & field management
  • Security features

• Code Quality:

  • Clippy clean ✅
  • Properly formatted ✅
  • Comprehensive documentation ✅

• Demo: Working example showcasing all features ✅

🎨 Architecture Benefits

• Extensible: Easy to add new provider types (Azure, AWS, etc.)
• Secure: Sensitive data properly masked and validated
• Testable: Comprehensive test coverage with clear assertions
• Clean: Action-based state management with clear separation
• Ready: Foundation supports async validation and UI integration

🚀 Next Steps Ready

This foundation prepares for:

1. UI integration with settings modal
2. Async provider validation
3. Backend HTTP client implementation
4. Configuration persistence
5. Additional provider types

Closes #29