pgwatch: extension version parsing kills all metric gathering for databases with 0.0.x extensions
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## Acceptance Criteria
- pgwatch extension version parsing handles versions in the `0.0.x` format without errors
- Metric gathering continues to function for databases with `0.0.x` extension versions
- Version parsing logic is robust against non-standard version formats (single digit, zero-prefixed, etc.)
- No metrics are silently dropped due to version parsing failures
## Definition of Done
- Fix implemented and tested against databases with `0.0.x` extension versions
- Existing version parsing for standard versions (e.g., `1.2.3`) continues to work correctly
- Regression test added to prevent future version parsing failures
- Monitoring data collection verified end-to-end for affected databases
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