Add friendly names system for recipes, effects, and media

- Add friendly_names table with unique constraints per actor
- Create NamingService with HMAC-signed timestamp version IDs
- Version IDs use base32-crockford encoding, always increase alphabetically
- Name normalization: spaces/underscores to dashes, lowercase, strip special chars
- Format: "my-effect 01hw3x9k" (space separator ensures uniqueness)
- Integrate naming into recipe, effect, and media uploads
- Resolve friendly names to CIDs during DAG execution
- Update effects UI to display friendly names
- Add 30 tests covering normalization, parsing, and service structure

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

app/routers/cache.py

@@ -224,9 +224,21 @@ async def upload_content(
     if error:
         raise HTTPException(400, error)
 
+    # Assign friendly name (use IPFS CID if available, otherwise local hash)
+    final_cid = ipfs_cid or cid
+    from ..services.naming_service import get_naming_service
+    naming = get_naming_service()
+    friendly_entry = await naming.assign_name(
+        cid=final_cid,
+        actor_id=ctx.actor_id,
+        item_type="media",
+        filename=file.filename,
+    )
+
     return {
-        "cid": ipfs_cid or cid,
+        "cid": final_cid,
         "content_hash": cid,  # Legacy, for backwards compatibility
+        "friendly_name": friendly_entry["friendly_name"],
         "filename": file.filename,
         "size": len(content),
         "uploaded": True,