feat(civitai): allow tag-only and sort-only browsing

Relax the empty-query guard so search works with tag, sort, or period
alone. Skip exact-match name filtering when no keyword is provided so
browse results return the full API response.

modules/civitai/search_civitai.py

@@ -1,3 +1,4 @@
+import re
 import time
 from installer import log
 from modules.civitai.client_civitai import client
@@ -20,12 +21,18 @@ def search_civitai(
         token: str = None,
         exact: bool = True,
 ) -> list[CivitModel]:
-    if not query:
-        log.error('CivitAI: empty query')
+    if not query and not tag and not sort:
+        log.error('CivitAI: no search criteria provided')
         return []
 
     t0 = time.time()
 
+    # URL query → extract model ID (e.g. https://civitai.com/models/967405/nova-orange-xl)
+    url_match = re.match(r'https?://civitai\.com/models/(\d+)', query.strip())
+    if url_match:
+        query = url_match.group(1)
+        log.info(f'CivitAI: extracted model id={query} from URL')
+
     # Numeric query → single model fetch
     if query.isnumeric():
         model = client.get_model(int(query), token=token)
@@ -49,7 +56,7 @@ def search_civitai(
 
     all_models = response.items
     exact_models: list[CivitModel] = []
-    if exact:
+    if exact and query:
         q_lower = query.lower()
         for model in all_models:
             names = [model.name.lower()]