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/Tabs/GroceryListTabView.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import OSLog
 import SwiftUI
 
 
@@ -150,7 +151,7 @@ class GroceryRecipeItem: Identifiable, Codable {
     
     
     func addItem(_ itemName: String, toRecipe recipeId: String, recipeName: String? = nil, saveGroceryDict: Bool = true) {
-        print("Adding item of recipe \(String(describing: recipeName))")
+        Logger.view.debug("Adding item of recipe \(String(describing: recipeName))")
         DispatchQueue.main.async {
             if self.groceryDict[recipeId] != nil {
                 self.groceryDict[recipeId]?.items.append(GroceryRecipeItem(itemName))
@@ -174,7 +175,7 @@ class GroceryRecipeItem: Identifiable, Codable {
     }
     
     func deleteItem(_ itemName: String, fromRecipe recipeId: String) {
-        print("Deleting item \(itemName)")
+        Logger.view.debug("Deleting item \(itemName)")
         guard let recipe = groceryDict[recipeId] else { return }
         guard let itemIndex = groceryDict[recipeId]?.items.firstIndex(where: { $0.name == itemName }) else { return }
         groceryDict[recipeId]?.items.remove(at: itemIndex)
@@ -186,20 +187,20 @@ class GroceryRecipeItem: Identifiable, Codable {
     }
     
     func deleteGroceryRecipe(_ recipeId: String) {
-        print("Deleting grocery recipe with id \(recipeId)")
+        Logger.view.debug("Deleting grocery recipe with id \(recipeId)")
         groceryDict.removeValue(forKey: recipeId)
         save()
         objectWillChange.send()
     }
     
     func deleteAll() {
-        print("Deleting all grocery items")
+        Logger.view.debug("Deleting all grocery items")
         groceryDict = [:]
         save()
     }
     
     func toggleItemChecked(_ groceryItem: GroceryRecipeItem) {
-        print("Item checked: \(groceryItem.name)")
+        Logger.view.debug("Item checked: \(groceryItem.name)")
         groceryItem.isChecked.toggle()
         save()
     }
@@ -229,7 +230,7 @@ class GroceryRecipeItem: Identifiable, Codable {
             ) else { return }
             self.groceryDict = groceryDict
         } catch {
-            print("Unable to load grocery list")
+            Logger.view.error("Unable to load grocery list")
         }
     }
 }