feat(blockchain): production genesis with encrypted keystore, remove admin minting

- Introduce production setup script: scripts/setup_production.py
  - Generates aitbc1genesis (treasury) and aitbc1treasury (spending) wallets
  - Encrypts keys via AES-GCM, stores password in keystore/.password (600)
  - Creates allocations.json and genesis.json with fixed total supply
  - Sets mint_per_unit=0 (no inflation)

- Update make_genesis.py:
  - Accept allocations file instead of single faucet
  - Use 'allocations' key in genesis (renamed from 'accounts')
  - Enforce mint_per_unit=0 in default params

- Remove admin mint endpoint:
  - Deleting MintFaucetRequest and /rpc/admin/mintFaucet from router.py
  - Removes faucet CLI command from cli/aitbc_cli/commands/blockchain.py

- RPC supply endpoint now computes total supply from genesis file (fixed)
- Validators endpoint derives list from trusted_proposers config

- Config enhancements (config.py):
  - Add keystore_path and keystore_password_file
  - Change mint_per_unit default to 0
  - main.py: Auto-load proposer private key from keystore into settings.proposer_key (hex) for future use

- Launcher scripts:
  - scripts/mainnet_up.sh: Loads .env.production, derives proposer_id from keystore if needed, starts node + RPC
  - scripts/devnet_up.sh: Updated to use new allocations-based genesis and proper proposer address

- Documentation:
  - Rewrite blockchain-node/README.md for production model (no faucet, keystore management, multi-chain)
  - Update MEMORY.md with production blockchain section

- Database: Multi-chain support already present via chain_id foreign keys.

This change makes the blockchain production‑ready: immutable supply, secure key storage, and removal of dev‑only admin functions.

Co-authored-by: Andreas Michael Fleckl <andreas@example.com>

apps/blockchain-node/src/aitbc_chain/config.py

@@ -31,7 +31,7 @@ class ChainSettings(BaseSettings):
     proposer_id: str = "ait-devnet-proposer"
     proposer_key: Optional[str] = None
 
-    mint_per_unit: int = 1000
+    mint_per_unit: int = 0  # No new minting after genesis for production
     coordinator_ratio: float = 0.05
 
     block_time_seconds: int = 2
@@ -58,5 +58,9 @@ class ChainSettings(BaseSettings):
     gossip_backend: str = "memory"
     gossip_broadcast_url: Optional[str] = None
 
+    # Keystore for proposer private key (future block signing)
+    keystore_path: Path = Path("./keystore")
+    keystore_password_file: Path = Path("./keystore/.password")
+
 
 settings = ChainSettings()