feat(recipes): add recently opened sort with modal open tracking

Track recipe modal opens in a separate stats file (never touching recipe
JSON/EXIF), expose a fire-and-forget POST endpoint, and add an 'opened'
sort that hides never-opened recipes as a true recently-opened view.
Includes i18n for all locales and backend/frontend tests.

py/services/recipe_scanner.py

@@ -14,6 +14,7 @@ from typing import Any, Callable, Dict, Iterable, List, Optional, Set, Tuple, Un
 from ..config import config
 from ..utils.constants import VALID_CHECKPOINT_SUB_TYPES, VALID_LORA_TYPES
 from ..utils.file_utils import calculate_autov3
+from ..utils.recipe_open_stats import RecipeOpenStats
 from .recipe_cache import RecipeCache
 from .recipes.errors import RecipeNotFoundError, RecipePersistenceError
 from natsort import natsorted
@@ -2782,9 +2783,11 @@ class RecipeScanner:
         Args:
             page: Current page number (1-based)
             page_size: Number of items per page
-            sort_by: Sort method ('name', 'date', 'loras_count', or 'random'
-                with an optional seed like 'random:abc123'; the part after
-                'random:' is the shuffle seed, not a direction)
+            sort_by: Sort method ('name', 'date', 'loras_count', 'opened',
+                or 'random' with an optional seed like 'random:abc123'; the
+                part after 'random:' is the shuffle seed, not a direction).
+                'opened' hides recipes that were never opened — it is a
+                "recently opened" view, not a plain reorder
             search: Search term
             filters: Dictionary of filters to apply
             search_options: Dictionary of search options to apply
@@ -2965,7 +2968,7 @@ class RecipeScanner:
                         ]
 
         # Apply sorting if not already handled by pre-sorted cache
-        if ":" in sort_by or sort_field in ("loras_count", "random"):
+        if ":" in sort_by or sort_field in ("loras_count", "random", "opened"):
             field, order = (sort_by.split(":") + ["desc"])[:2]
             reverse = order.lower() == "desc"
 
@@ -2984,6 +2987,20 @@ class RecipeScanner:
                     ),
                     reverse=reverse,
                 )
+            elif field == "opened":
+                # "Recently Opened" view: recipes never opened are hidden.
+                # The open stats live outside recipe metadata; see
+                # RecipeOpenStats.
+                opened_map = RecipeOpenStats().get_opened_map()
+                filtered_data = [
+                    item
+                    for item in filtered_data
+                    if opened_map.get(str(item.get("id", ""))) is not None
+                ]
+                filtered_data.sort(
+                    key=lambda x: opened_map.get(str(x.get("id", "")), 0),
+                    reverse=reverse,
+                )
             elif field == "loras_count":
                 filtered_data.sort(
                     key=lambda x: len(x.get("loras", [])), reverse=reverse