Add cryptographic signatures to GLSH token metadata
- Signed all metadata fields (name, description, url, ticker, decimals, logo) - Used DAO member1 signing key from minting policy script - Public key: 78cdc5a60715b21043c2b4c7be607d830d9cbdb0f34bfb9d22abca24daf7f4e3 - Addresses reviewer feedback from @Kartiiyer12