fix: add eth-account dependency to resolve import error

DEPENDENCY FIX: Add missing eth_account module for Guardian Contract tests

Issue Fixed:
❌ ModuleNotFoundError: No module named 'eth_account'
❌ ImportError in test_guardian_contract.py
❌ Guardian Contract tests failing to collect

Root Cause:
- Guardian Contract imports eth_account.Account
- eth_account module not installed in CI environment
- Missing dependency in workflow setup

Solution Applied:
✅ Added eth-account to additional dependencies
✅ Updated both main test job and specific test job
✅ Ensures Guardian Contract tests can import properly

Changes Made:
1. Main Test Dependencies:
   - Added eth-account to venv/bin/pip install line
   - Fixed for all Python test scenarios

2. Specific Test Job:
   - Added eth-account to specific test job dependencies
   - Ensures consistency across all test runs

Impact:
- Guardian Contract tests now import successfully
- No more ModuleNotFoundError for eth_account
- All Python tests can run properly
- Test collection works without errors

This resolves the import error that was preventing Guardian Contract
tests from running in the CI/CD environment.

.gitea/workflows/python-tests.yml

@@ -95,7 +95,7 @@ jobs:
             echo "=== ADDITIONAL DEPENDENCIES ==="
             # Install missing dependencies that cause import errors
             echo "Installing additional test dependencies..."
-            venv/bin/pip install pydantic-settings sqlmodel sqlalchemy requests slowapi
+            venv/bin/pip install pydantic-settings sqlmodel sqlalchemy requests slowapi eth-account
             
             echo "=== PYTHON PATH SETUP ==="
             # Set up comprehensive Python path for complex import patterns
@@ -236,7 +236,7 @@ jobs:
             python3 -m venv venv && source venv/bin/activate
             $POETRY_CMD lock || echo "Lock file update completed"
             $POETRY_CMD install --no-root
-            venv/bin/pip install pydantic-settings sqlmodel sqlalchemy requests slowapi pytest pytest-cov pytest-mock
+            venv/bin/pip install pydantic-settings sqlmodel sqlalchemy requests slowapi pytest pytest-cov pytest-mock eth-account
             
             export PYTHONPATH="/opt/gitea-runner/workspace/repo:$PYTHONPATH"
             export PYTHONPATH="/opt/gitea-runner/workspace/repo/aitbc:$PYTHONPATH"