Remove unused backend helpers

[skyfallwastaken]

Summary of the problem

The backend accumulated isolated helpers and constants that no longer had callers. Keeping these definition-only symbols made the server code harder to navigate and obscured the active implementations.

Describe your changes

• Remove unused controller and concern helpers for authorization, dashboard data, settings options, and currently-hacking props.
• Remove unused leaderboard cache, heartbeat import, and import dump client methods.
• Remove an unused flavor-text method and the authorization constant orphaned by this cleanup.
• Preserve all routes, middleware, generated code, dynamic entry points, and external HTTP APIs.

Verification included repo-wide direct-reference and dynamic-dispatch searches, a post-rebase symbol scan, and git diff --check. The full bin/ci suite could not run locally because the Amp orb does not provide Docker or Ruby; GitHub Actions is expected to provide full-suite coverage for this PR.

Screenshots / Media

Not applicable; there are no visual changes.

[Copilot]

Pull request overview

This PR removes backend helper methods/constants that no longer have any callers, reducing navigation noise and keeping the active server implementation surface area clearer.

Changes:

• Removed unused “flavor text” and Inertia/shared-props helpers.
• Simplified service helpers by deleting unused cache/import client methods and an unused heartbeat-counting helper.
• Removed unused dashboard/settings/auth convenience helpers/constants.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/flavor_text.rb	Removes an unused rare_compliment method.
app/services/leaderboard_cache.rb	Drops unused timezone key + fetch helpers, leaving only the used read/write/key API.
app/services/heartbeat_import_service.rb	Removes an unused count_heartbeats helper (import logic still counts during SAX parsing).
app/services/heartbeat_import_dump_client.rb	Removes an unused base_url_for class helper.
app/controllers/settings/base_controller.rb	Removes an unused options_props wrapper helper.
app/controllers/inertia_controller.rb	Removes an unused currently_hacking_props helper (other callers still invoke the job directly).
app/controllers/concerns/dashboard_data.rb	Removes an unused dashboard_filters helper.
app/controllers/concerns/auth_helpers.rb	Removes an unused superadmin constant/method, keeping only the used admin helpers.

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