feat: implement real water quality data with 38 Irish beaches

- Add static dataset of 38 Irish beaches with 2024 water quality data
- Implement nearest beach finder (within 20km radius)
- Return real water quality status (excellent/good/sufficient/poor)
- Include E.coli and Enterococci parameters
- Remove unimplemented services from EnvironmentalDataPanel (beach quality, biodiversity)
- Update panel description to reflect available data

Coverage: Dublin, Wicklow, Wexford, Waterford, Cork, Kerry, Clare, Galway, Mayo, Sligo, Donegal, Antrim, Down

src/components/external/EnvironmentalDataPanel.tsx

@@ -2,8 +2,6 @@
 import { WeatherWidget } from './WeatherWidget';
 import { TideDisplay } from './TideDisplay';
 import { WaterQualityIndicator } from './WaterQualityIndicator';
-import { BeachQualityDisplay } from './BeachQualityDisplay';
-import { BiodiversityInfo } from './BiodiversityInfo';
 
 interface EnvironmentalDataPanelProps {
   latitude: number;
@@ -21,15 +19,13 @@ export function EnvironmentalDataPanel({
       <div className="mb-4">
         <h2 className="text-xl font-bold text-gray-800 mb-2">Environmental Context</h2>
         <p className="text-sm text-gray-600">
-          Real-time environmental data for this location
+          Weather, tide, and water quality data for this location
         </p>
       </div>
 
       <WeatherWidget latitude={latitude} longitude={longitude} />
       <TideDisplay latitude={latitude} longitude={longitude} />
       <WaterQualityIndicator latitude={latitude} longitude={longitude} />
-      <BeachQualityDisplay latitude={latitude} longitude={longitude} />
-      <BiodiversityInfo latitude={latitude} longitude={longitude} />
     </div>
   );
 }