prefect server in zig

update roadmap: mark migrations as implemented

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

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ROADMAP.md
··· 210 210 - [x] service lifecycle management 211 211 - [x] postgres connection pooling (pg.zig built-in) 212 212 - [ ] sqlite connection pooling 213 - - [ ] migrations 213 + - [x] migrations 214 214 - [ ] graceful shutdown 215 215 - [ ] configuration file support 216 216