[Feature]: Move Server Hook Code Out of Build-Time Path

[Suvam-paul145]

The server hooks file uses a building flag to guard code that should only run at
server start time. The TODO suggests moving this logic to a proper started-server
hook.

What needs to happen:

• Identify the correct SvelteKit server lifecycle hook.
• Move the guarded logic there and remove the building flag.

Relevant files:

• frontend/src/hooks.server.ts (line 42)

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