Add since/until date filtering to activities endpoint

[AntonioObra]

Summary

Adds since and until query parameters to the GET /:account_slug/activities endpoint so API clients can filter the activity feed by date range.

Requested in #2832.

Changes

• app/controllers/activities_controller.rb - filter activities by since and until params
• app/models/event.rb - add since_date and until_date scopes to Event
• docs/api/sections/activities.md - document the new query parameters
• test/controllers/activities_controller_test.rb - add controller tests for date filtering

Usage

GET /:account_slug/activities?since=2026-04-01
GET /:account_slug/activities?until=2026-04-21
GET /:account_slug/activities?since=2026-04-01&until=2026-04-21

Dates are ISO 8601 (YYYY-MM-DD)

[claude]

Claude Code Review

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[Copilot]

Pull request overview

Adds date-range filtering to the activities feed so API clients can request a subset of events by created_at using since/until.

Changes:

• Add since_date / until_date scopes to Event and apply them in ActivitiesController#index.
• Document new since and until query parameters for GET /:account_slug/activities.
• Add controller tests covering basic date filtering scenarios.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
app/controllers/activities_controller.rb	Applies since/until filters to the activities relation.
app/models/event.rb	Introduces since_date / until_date scopes for created_at filtering.
docs/api/sections/activities.md	Documents the new query params and expected format.
test/controllers/activities_controller_test.rb	Adds tests for since, until, and combined filtering.

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