Modernize networking layer and fix category navigation and recipe list bugs

Network layer:
- Replace static CookbookApi protocol with instance-based CookbookApiProtocol
  using async/throws instead of tuple returns
- Refactor ApiRequest to use URLComponents for proper URL encoding, replace
  print statements with OSLog, and return typed NetworkError cases
- Add structured NetworkError variants (httpError, connectionError, etc.)
- Remove global cookbookApi constant in favor of injected dependency on AppState
- Delete unused RecipeEditViewModel, RecipeScraper, and Scraper playground

Data & model fixes:
- Add custom Decodable for RecipeDetail with safe fallbacks for malformed JSON
- Make Category Hashable/Equatable use only `name` so NavigationSplitView
  selection survives category refreshes with updated recipe_count
- Return server-assigned ID from uploadRecipe so new recipes get their ID
  before the post-upload refresh block executes

View updates:
- Refresh both old and new category recipe lists after upload when category
  changes, mapping empty recipeCategory to "*" for uncategorized recipes
- Raise deployment target to iOS 18, adopt new SwiftUI API conventions
- Clean up alerts, onboarding views, and settings

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

Nextcloud Cookbook iOS Client/Views/Recipes/TimerView.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import OSLog
 import SwiftUI
 import Combine
 import AVFoundation
@@ -152,7 +153,7 @@ extension RecipeTimer {
             try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
             try AVAudioSession.sharedInstance().setActive(true)
         } catch {
-            print("Failed to set audio session category. Error: \(error)")
+            Logger.view.error("Failed to set audio session category. Error: \(error)")
         }
     }
     
@@ -163,7 +164,7 @@ extension RecipeTimer {
                 audioPlayer?.prepareToPlay()
                 audioPlayer?.numberOfLoops = -1 // Loop indefinitely
             } catch {
-                print("Error loading sound file: \(error)")
+                Logger.view.error("Error loading sound file: \(error)")
             }
         }
     }
@@ -185,9 +186,9 @@ extension RecipeTimer {
     func requestNotificationPermissions() {
         UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, error in
             if granted {
-                print("Notification permission granted.")
+                Logger.view.debug("Notification permission granted.")
             } else if let error = error {
-                print("Notification permission denied because: \(error.localizedDescription).")
+                Logger.view.error("Notification permission denied because: \(error.localizedDescription).")
             }
         }
     }
@@ -204,7 +205,7 @@ extension RecipeTimer {
 
         UNUserNotificationCenter.current().add(request) { error in
             if let error = error {
-                print("Error scheduling notification: \(error)")
+                Logger.view.error("Error scheduling notification: \(error)")
             }
         }
     }