Include ipfs_cid in republish payload to L2

When republishing/updating an asset on L2, now sends the IPFS CID
so L2 can update its record and pin the content.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server.py

@@ -2925,6 +2925,10 @@ async def republish_cache_to_l2(
     if not token:
         raise HTTPException(401, "Authentication token required")
 
+    # Get IPFS CID from cache item
+    cache_item = await database.get_cache_item(content_hash)
+    ipfs_cid = cache_item.get("ipfs_cid") if cache_item else None
+
     # Call L2 update endpoint (use user's L2 server)
     l2_server = ctx.l2_server
     try:
@@ -2935,6 +2939,7 @@ async def republish_cache_to_l2(
                 "description": meta.get("description"),
                 "tags": meta.get("tags"),
                 "origin": meta.get("origin"),
+                "ipfs_cid": ipfs_cid,
                 "metadata": {
                     "filename": meta.get("filename"),
                     "folder": meta.get("folder"),