Add weather feature with WeatherKit integration for mood entries

Fetch and display weather data (temp, condition, hi/lo, humidity) when
users log a mood. Weather is stored as JSON on MoodEntryModel and shown
as a card in EntryDetailView. Premium-gated with location permission
prompt. Includes BGTask retry for failed fetches and full analytics.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/Persisence/DataControllerProtocol.swift

@@ -49,6 +49,10 @@ protocol MoodDataWriting {
     @discardableResult
     func updatePhoto(forDate date: Date, photoID: UUID?) -> Bool
 
+    /// Update weather for an entry
+    @discardableResult
+    func updateWeather(forDate date: Date, weatherJSON: String?) -> Bool
+
     /// Fill in missing dates with placeholder entries
     func fillInMissingDates()
 

Shared/Persisence/DataControllerUPDATE.swift

@@ -38,6 +38,19 @@ extension DataController {
         return true
     }
 
+    // MARK: - Weather
+
+    @discardableResult
+    func updateWeather(forDate date: Date, weatherJSON: String?) -> Bool {
+        guard let entry = getEntry(byDate: date) else {
+            return false
+        }
+
+        entry.weatherJSON = weatherJSON
+        saveAndRunDataListeners()
+        return true
+    }
+
     // MARK: - Photo
 
     @discardableResult