Fixes two schema validation issues affecting 40 legacy projects:

1. Missing required project_status fields:
   - Added live_status (boolean)
   - Added testnet (boolean)
   - Added mainnet (boolean)

2. Ecosystem capitalization mismatch:
   - Changed ecosystem values to lowercase (e.g., "Ethereum" → "ethereum")
   - Schema requires lowercase ecosystem names

Migration logic:
- Projects with version "Mainnet" → mainnet: true, live_status: true
- Ecosystem values mapped to allowed lowercase values
- Unknown ecosystems default to "other"

Fixes failing tests in PRs web3privacy#2000, web3privacy#2004, web3privacy#2006, web3privacy#2007
Test results: 40/40 projects successfully migrated

Projects affected:
fileverse, mysterium-network, elusiv, zkvote, starkex, hopr,
deeper-network, firo, oasis-network, zcash, privatepool,
tornado-cash, iden3, circom, zksync, darkfi, sentinel,
snarkjs, findora, cake-wallet, typhoon-network, iron-fish,
concordium, zk-money, suterusu, oxen, orchid, rotki,
mobilecoin, sienna-network, monero, zano, zeal, xx-network,
mask-network, fluidkey, webb-protocol, wasabi-wallet,
semaphore, incognito