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_120549/config/.pre-commit-config.yaml

@@ -1,75 +0,0 @@
-repos:
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.5.0
-    hooks:
-      - id: trailing-whitespace
-      - id: end-of-file-fixer
-      - id: check-yaml
-      - id: check-added-large-files
-      - id: check-json
-      - id: check-toml
-      - id: check-merge-conflict
-      - id: debug-statements
-      - id: check-docstring-first
-
-  - repo: https://github.com/psf/black
-    rev: 24.3.0
-    hooks:
-      - id: black
-        language_version: python3.13
-        args: [--line-length=88]
-
-  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.1.15
-    hooks:
-      - id: ruff
-        args: [--fix, --exit-non-zero-on-fix]
-        additional_dependencies:
-          - ruff==0.1.15
-
-  - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.8.0
-    hooks:
-      - id: mypy
-        additional_dependencies:
-          - types-requests
-          - types-setuptools
-          - types-PyYAML
-          - sqlalchemy[mypy]
-        args: [--ignore-missing-imports, --strict-optional]
-
-  - repo: https://github.com/pycqa/isort
-    rev: 5.13.2
-    hooks:
-      - id: isort
-        args: [--profile=black, --line-length=88]
-
-  - repo: https://github.com/PyCQA/bandit
-    rev: 1.7.5
-    hooks:
-      - id: bandit
-        args: [-c, bandit.toml]
-        additional_dependencies:
-          - bandit==1.7.5
-
-  - repo: https://github.com/Yelp/detect-secrets
-    rev: v1.4.0
-    hooks:
-      - id: detect-secrets
-        args: [--baseline, .secrets.baseline]
-
-  - repo: local
-    hooks:
-      - id: dotenv-linter
-        name: dotenv-linter
-        entry: python scripts/focused_dotenv_linter.py
-        language: system
-        pass_filenames: false
-        args: [--check]
-        files: \.env\.example$|.*\.py$|.*\.yml$|.*\.yaml$|.*\.toml$|.*\.sh$
-
-      - id: file-organization
-        name: file-organization
-        entry: scripts/check-file-organization.sh
-        language: script
-        pass_filenames: false