Add PlantGuide iOS app with plant identification and care management

- Implement camera capture and plant identification workflow
- Add Core Data persistence for plants, care schedules, and cached API data
- Create collection view with grid/list layouts and filtering
- Build plant detail views with care information display
- Integrate Trefle botanical API for plant care data
- Add local image storage for captured plant photos
- Implement dependency injection container for testability
- Include accessibility support throughout the app

Bug fixes in this commit:
- Fix Trefle API decoding by removing duplicate CodingKeys
- Fix LocalCachedImage to load from correct PlantImages directory
- Set dateAdded when saving plants for proper collection sorting

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

PlantGuideTests/PlantGuideTests.swift

@@ -0,0 +1,17 @@
+//
+//  PlantGuideTests.swift
+//  PlantGuideTests
+//
+//  Created by Trey Tartt on 1/21/26.
+//
+
+import Testing
+@testable import PlantGuide
+
+struct PlantGuideTests {
+
+    @Test func example() async throws {
+        // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+    }
+
+}