fix(databases): remove leftover top-level Usage tab

[HarshMN2345]

Summary

• Storage, functions, and sites already had their all-time Usage tab removed but databases still had one — removes it for consistency along with its dead command-center shortcut and route page.

Test plan

• bun run check passes with no new errors
• Databases section no longer shows a Usage tab
• g u shortcut no longer offered in databases/storage command palette

[greptile-apps]

Greptile Summary

This PR removes the leftover top-level Usage routes for project services. The main changes are:

• Removes the Databases Usage tab and top-level command shortcut.
• Deletes the top-level Databases usage page and loader.
• Deletes empty top-level Usage route placeholders for Functions, Sites, and Storage.
• Removes the top-level Storage usage command shortcut.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
src/routes/(console)/project-[region]-[project]/databases/+layout.svelte	Removes the top-level Databases usage shortcut and cleans up now-unused navigation helpers.
src/routes/(console)/project-[region]-[project]/databases/header.svelte	Removes the top-level Databases Usage tab from the section header.
src/routes/(console)/project-[region]-[project]/databases/usage/[[period]]/+page.svelte	Deletes the top-level Databases usage chart page.
src/routes/(console)/project-[region]-[project]/databases/usage/[[period]]/+page.ts	Deletes the loader for the removed top-level Databases usage page.
src/routes/(console)/project-[region]-[project]/functions/usage/[[period]]/+page.svelte	Deletes an empty top-level Functions usage page.
src/routes/(console)/project-[region]-[project]/functions/usage/[[period]]/+page.ts	Deletes the empty loader for the removed top-level Functions usage page.
src/routes/(console)/project-[region]-[project]/sites/usage/[[period]]/+page.svelte	Deletes an empty top-level Sites usage page.
src/routes/(console)/project-[region]-[project]/sites/usage/[[period]]/+page.ts	Deletes the empty loader for the removed top-level Sites usage page.
src/routes/(console)/project-[region]-[project]/storage/+layout.svelte	Removes the top-level Storage usage shortcut while keeping the remaining bucket commands intact.
src/routes/(console)/project-[region]-[project]/storage/usage/[[period]]/+page.svelte	Deletes an empty top-level Storage usage page.
src/routes/(console)/project-[region]-[project]/storage/usage/[[period]]/+page.ts	Deletes the empty loader for the removed top-level Storage usage page.

_{Reviews (1): Last reviewed commit: "fix(databases): remove leftover top-leve..." | Re-trigger Greptile}