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/Onboarding/TokenLoginView.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import OSLog
 import SwiftUI
 
 
@@ -72,7 +73,7 @@ struct TokenLoginView: View {
             case .username:
                 focusedField = .token
             default:
-                print("Attempting to log in ...")
+                Logger.view.debug("Attempting to log in ...")
             }
         }
     }
@@ -87,21 +88,16 @@ struct TokenLoginView: View {
             showAlert = true
             return false
         }
-        
+
         UserSettings.shared.setAuthString()
-        let (data, error) = await cookbookApi.getCategories(auth: UserSettings.shared.authString)
-        
-        if let error = error {
+        let client = CookbookApiFactory.makeClient()
+        do {
+            let _ = try await client.getCategories()
+            return true
+        } catch {
             alertMessage = "Login failed. Please check your inputs and internet connection."
             showAlert = true
             return false
         }
-        
-        guard let data = data else {
-            alertMessage = "Login failed. Please check your inputs."
-            showAlert = true
-            return false
-        }
-        return true
     }
 }