refactor: consolidate blockchain explorer into single app and update backup ignore patterns

- Remove standalone explorer-web app (README, HTML, package files)
- Add /web endpoint to blockchain-explorer for web interface access
- Update .gitignore to exclude application backup archives (*.tar.gz, *.zip)
- Add backup documentation files to .gitignore (BACKUP_INDEX.md, README.md)
- Consolidate explorer functionality into main blockchain-explorer application

genesis_ait_devnet.yaml

@@ -0,0 +1,25 @@
+genesis:
+  chain_id: "ait-devnet"
+  chain_type: "main"
+  purpose: "development"
+  name: "AITBC Development Network"
+  description: "Development network for AITBC multi-chain testing"
+  timestamp: "2026-03-06T18:00:00Z"
+  parent_hash: "0x0000000000000000000000000000000000000000000000000000000000000000"
+  gas_limit: 10000000
+  gas_price: 1000000000
+  consensus:
+    algorithm: "poa"
+    validators:
+      - "ait1devproposer000000000000000000000000000000"
+  accounts:
+    - address: "aitbc1genesis"
+      balance: "1000000"
+      type: "regular"
+    - address: "aitbc1faucet"
+      balance: "100000"
+      type: "faucet"
+  parameters:
+    block_time: 5
+    max_block_size: 1048576
+    min_stake: 1000