report unbound inscription locations as zeros

[rafaelcr]

To be consistent with ordinals.com, we should report the location and output of unbound inscriptions as zeros, for example
https://ordinals.com/inscription/001e4a35c2fd86700f753a847fdeabd0f8f6aa8c106be9e3b4062fe1d3bce4f2i0

Our response right now is:

{
   "id":"001e4a35c2fd86700f753a847fdeabd0f8f6aa8c106be9e3b4062fe1d3bce4f2i0",
   "number":86007045,
   "address":null,
   "genesis_address":null,
   "genesis_block_height":884356,
   "genesis_block_hash":"000000000000000000020549f2c41dfe2df2563d763241214e99aaa3ec78023d",
   "genesis_tx_id":"001e4a35c2fd86700f753a847fdeabd0f8f6aa8c106be9e3b4062fe1d3bce4f2",
   "genesis_fee":"830",
   "genesis_timestamp":1739905698000,
   "tx_id":"001e4a35c2fd86700f753a847fdeabd0f8f6aa8c106be9e3b4062fe1d3bce4f2",
   "location":"297e09f870185e6e6df6cb42a5cae6c4b0540a59abadd0619339704a2eceb69d:0:312500000",
   "output":"297e09f870185e6e6df6cb42a5cae6c4b0540a59abadd0619339704a2eceb69d:0",
   "value":"0",
   "offset":"312500000",
   "sat_ordinal":"1894386847040783",
   "sat_rarity":"common",
   "sat_coinbase_height":721018,
   "mime_type":"",
   "content_type":"",
   "content_length":0,
   "timestamp":1739905698000,
   "curse_type":"unrecognized_field",
   "recursive":false,
   "recursion_refs":null,
   "parent":"feecbffa3544c385c406243831ec525ee8c460d382f7b948e64fdefed9a4b865i719",
   "delegate":null,
   "metadata":null,
   "meta_protocol":null,
   "charms":[
      "unbound"
   ]
}

[rafaelcr]

Reopening because this might be affected by an off-by-one error in ordinals dot com or something we're missing in our indexer ordinals/ord#4237