fix: separate recipe preview image from task images

Recipe image_path is now used as preview thumbnail only. Removed
auto-creation of "Technical Drawing" task from recipe upload, and
removed recipe image strip from task_execute view. Each task displays
its own file_path independently.

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

client/templates/measure/task_execute.html

@@ -55,7 +55,6 @@
   window.__taskSubtasks = {{ task.subtasks|tojson if task.subtasks else '[]' }};
   window.__taskAnnotations = {{ task.annotations_json|default('null')|tojson }};
   window.__allTaskIds = {{ all_task_ids|tojson }};
-  window.__recipeImagePath = {{ (recipe.image_path or '')|tojson }};
 </script>
 
 <div class="h-screen flex flex-col overflow-hidden"
@@ -173,13 +172,6 @@
        ────────────────────────────────────────────── #}
     <div class="flex-1 flex flex-col overflow-hidden bg-[var(--bg-secondary)]">
 
-      {# Recipe image strip (small, top, optional) #}
-      <div x-show="recipeImagePath" class="shrink-0 bg-[var(--bg-card)] border-b border-[var(--border-color)] px-2 py-1 flex items-center justify-center">
-        <img :src="'/measure/api/files/' + recipeImagePath"
-             alt="{{ _('Immagine ricetta') }}"
-             class="max-h-20 object-contain rounded">
-      </div>
-
       {# Main image area #}
       <div class="flex-1 overflow-hidden relative">
 
@@ -490,8 +482,6 @@ function taskExecute() {
     subtasks: window.__taskSubtasks,
     lotNumber: '{{ lot_number or '' }}',
     serialNumber: '{{ serial_number or '' }}',
-    recipeImagePath: window.__recipeImagePath || '',
-
     // ---- Measurement state ----
     currentIndex: 0,
     measurements: [],   // [{subtask_id, value, pass_fail, deviation}, ...]