Fix pension_schedule table schema to support multiple vesting milestones per pension

- Changed primary key from composite (file_no, version) to auto-increment id
- A pension can have multiple vesting schedule entries (e.g., vests 20% at year 1, 100% at year 5)
- Added index on (file_no, version) for efficient lookups
- Successfully imported 502 vesting schedule entries for 416 unique pensions
- Some pensions have up to 6 vesting milestones

data-import/unknown_a3797fd6-a970-422e-b71d-1b6494e587ee.csv

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+XXXXX