maximunited / imou_life / 25341560263

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feat: implement dynamic device discovery for Gold tier compliance (#35)

Implements automatic detection and addition of new Imou devices to Home Assistant after initial setup.

## Key Features
- Background polling every 60 minutes (configurable 5 min - 24 hours)
- User confirmation dialog before adding discovered devices
- Enabled by default for seamless UX
- Single coordinator on first entry (prevents duplicate polling)
- Graceful rate limit handling
- Transfer support when first entry removed

## Implementation
- Created ImouDiscoveryCoordinator for periodic device polling
- Added discovery source handler in config flow
- Implemented lifecycle management (start/stop/transfer)
- Added integration options for enable/disable and interval

## Test Coverage
- ? All 418 unit tests passing
- ? 13 discovery coordinator tests
- ? 8 config flow discovery tests
- ? Zero test failures

## Files Modified
- coordinator.py: ImouDiscoveryCoordinator class
- __init__.py: Discovery initialization and lifecycle
- config_flow.py: Discovery handlers and options
- const.py: Discovery constants
- strings.json, translations/en.json: Translations
- tests/fixtures/mocks.py: Enhanced mock framework

## Files Added
- tests/unit/test_discovery_coordinator.py (13 tests)
- tests/unit/test_config_flow_discovery.py (8 tests)
- tests/integration/test_multi_device_discovery.py (infrastructure)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

72 of 111 new or added lines in 4 files covered. (64.86%)

1448 of 1647 relevant lines covered (87.92%)

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