feat: replace legacy vote buttons with AJAX submission and dynamic count updates

Replace static form-based vote buttons with a new VoteManager class that submits votes via fetch, returns JSON with net/up/down/current value, and updates vote count spans using data-vote-count attributes across all templates. Add JSONResponse endpoint in votes router for AJAX requests, switch VoteManager import from Http to Toast for error feedback, and refactor link_attachments to handle comma-separated UIDs.

devplacepy/attachments.py

@@ -186,13 +186,14 @@ def link_attachments(uids, target_type, target_uid):
     if not uids:
         return
     attachments = get_table("attachments")
-    for uid in uids:
-        uid = uid.strip()
-        if not uid:
-            continue
-        existing = attachments.find_one(uid=uid)
-        if existing:
-            attachments.update({"id": existing["id"], "uid": uid, "target_type": target_type, "target_uid": target_uid}, ["id"])
+    for raw in uids:
+        for uid in str(raw).split(","):
+            uid = uid.strip()
+            if not uid:
+                continue
+            existing = attachments.find_one(uid=uid)
+            if existing:
+                attachments.update({"id": existing["id"], "target_type": target_type, "target_uid": target_uid}, ["id"])
 
 
 def delete_attachment(uid):