Add Postgres migration + seed pipeline with env template#1

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Jakebhudson wants to merge 3 commits intoFarrisBaboo:mainfrom

Jakebhudson:main

Commits on Sep 8, 2025

Checkpoint: migration + seed pipeline working with Postgres
Jakebhudson
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Add Postgres migration + seed pipeline, env template, and dotenv path fixes
Jakebhudson
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Commits on Sep 10, 2025

Refactor: API endpoints now query Postgres (streams + stream-names)
Jakebhudson
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