feat: create new onion services via api

app/util/onion.py

@@ -0,0 +1,19 @@
+import base64
+import hashlib
+
+
+def onion_hostname(onion_public_key: bytes) -> str:
+    p = onion_public_key[32:]
+
+    h = hashlib.sha3_256()
+    h.update(b".onion checksum")
+    h.update(p)
+    h.update(b"\x03")
+    checksum = h.digest()
+
+    result = bytearray(p)
+    result.extend(checksum[0:2])
+    result.append(0x03)
+
+    onion = base64.b32encode(result).decode("utf-8").strip("=")
+    return onion.lower()