chore: remove obsolete backup directories from March 2026

- Deleted backup_20260329_183359 (block height 2222, 3 accounts, 4 transactions)
- Deleted dependency_backup_20260331_204119 (pyproject.toml, requirements files)
- Deleted pre_deployment_20260402_120429 (config examples and environment templates)

backups/pre_deployment_20260402_120838/config/economics_test.json

@@ -1,26 +0,0 @@
-{
-    "staking": {
-        "min_stake_amount": 1000.0,
-        "unstaking_period": 21,
-        "max_delegators_per_validator": 100,
-        "commission_range": [0.01, 0.10]
-    },
-    "rewards": {
-        "base_reward_rate": 0.05,
-        "distribution_interval": 86400,
-        "min_reward_amount": 0.001,
-        "delegation_reward_split": 0.9
-    },
-    "gas": {
-        "base_gas_price": 0.001,
-        "max_gas_price": 0.1,
-        "min_gas_price": 0.0001,
-        "congestion_threshold": 0.8,
-        "price_adjustment_factor": 1.1
-    },
-    "security": {
-        "monitoring_interval": 60,
-        "detection_history_window": 3600,
-        "max_false_positive_rate": 0.05
-    }
-}