Revert "Set EVENT_REPOSITORY_DEFAULT_STORE default to clickhouse_v2"

[Copilot]

Reverts commit 495a253.

Restores EVENT_REPOSITORY_DEFAULT_STORE default from "clickhouse_v2" back to "postgres".

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention.
• I ran and tested the code works

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Testing

Single-line env schema default change; no runtime testing required.

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Changelog

• Reverted EVENT_REPOSITORY_DEFAULT_STORE default value from "clickhouse_v2" to "postgres" in apps/webapp/app/env.server.ts

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Screenshots

N/A - configuration change only

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Original prompt

Can you revert the latest commit 495a253 and create a PR for the revert

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