Refactor scraping system to workflow-based architecture

Major architectural changes:
- Replace monolithic ScrapingService with workflow-based system
- Extract scraping logic into discrete, testable steps
- Add configuration-driven selectors, JavaScript templates, and text patterns
- Implement step registry and workflow factory for extensibility
- Add PageState tracking and step dependencies
- Make IWorkflow generic to support different response types

New components:
- Scraping steps organized by category (Navigation, Search, Map, Metadata, Capture)
- BaseScrapingStep base class with common dependencies
- ScrapingContext for shared state between steps
- RadarScrapingWorkflow orchestrating step execution
- SelectorService for configurable element selection
- Configuration models (SelectorConfig, TextPatternsConfig, JavaScriptTemplatesConfig)

Performance and monitoring:
- Add step-level timing metrics with historical tracking
- Log step durations and compare to averages
- Warn on slow steps/workflows (50%+ slower than average)
- Integrate metrics with CacheService

Configuration improvements:
- Externalize all selectors to appsettings.json
- Externalize JavaScript templates to appsettings.json
- Externalize text patterns to appsettings.json
- Support Docker configuration via mounted appsettings.json
- Remove hardcoded waits, use configurable timeouts

Bug fixes:
- Fix DebugService collection modification exception
- Fix ResetToFirstFrameStep click interception with JavaScript fallback
- Remove minutes ago fallback, use timestamp parsing only
- Update timestamp parsing for new BOM website format

Documentation:
- Update README with new architecture details
- Add configuration section with Docker guidance
- Add development guidelines for extending scraping system
- Add performance monitoring documentation

Services/Scraping/IScrapingStep.cs

@@ -0,0 +1,28 @@
+namespace BomLocalService.Services.Scraping;
+
+/// <summary>
+/// Interface for a single scraping step
+/// </summary>
+public interface IScrapingStep
+{
+    /// <summary>
+    /// Unique name of the step
+    /// </summary>
+    string Name { get; }
+    
+    /// <summary>
+    /// Names of steps that must complete before this step can execute
+    /// </summary>
+    string[] Prerequisites { get; }
+    
+    /// <summary>
+    /// Checks if the step can execute in the current page state
+    /// </summary>
+    bool CanExecute(ScrapingContext context);
+    
+    /// <summary>
+    /// Executes the step
+    /// </summary>
+    Task<ScrapingStepResult> ExecuteAsync(ScrapingContext context, CancellationToken cancellationToken);
+}
+