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

Models/TextPatternsConfig.cs

@@ -0,0 +1,23 @@
+namespace BomLocalService.Models;
+
+/// <summary>
+/// Text patterns and regex configurations for parsing page content
+/// </summary>
+public class TextPatternsConfig
+{
+    public string ResultsCountPattern { get; set; } = @"(\d+)\s+of\s+(\d+)";
+    public string TimestampPattern { get; set; } = @"(?:[A-Za-z]+\s+)?\d{1,2}\s+[A-Za-z]{3},?\s+\d{1,2}:\d{2}\s+(?:am|pm)";
+    public string ObservationTimePattern { get; set; } = @"Observations:\s*(\d+)\s*minutes?\s*ago";
+    public string ForecastTimePattern { get; set; } = @"Forecast:\s*(\d+)\s*minutes?\s+ago";
+    public string ForecastHourAgoPattern { get; set; } = @"Forecast:\s*an\s+hour\s+ago";
+    public string WeatherStationPattern { get; set; } = @"at\s+([^,]+)\s+weather\s+station";
+    public string DistancePattern { get; set; } = @"(\d+)\s*km\s+from";
+    
+    public Dictionary<string, string> ExpectedTexts { get; set; } = new()
+    {
+        ["PlayButtonLabel"] = "Play",
+        ["PauseButtonLabel"] = "Pause",
+        ["RadarLinkText"] = "Rain radar and weather map"
+    };
+}
+