Add search bar for organization members tab page

[lunny]

Resolve #37072

[Copilot]

Pull request overview

Adds member search functionality to the Organization Settings → Members page (resolving #37072) by wiring a q query parameter from the UI through the web router into the org-member lookup logic.

Changes:

• Add a search bar and “shown / total” member count display to the members template, including a “no results” empty state.
• Extend org member lookup options to support keyword filtering (username/full name/email with privacy rules) and persist query params through pagination.
• Add model-level tests covering member search behavior (including private email visibility rules).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
templates/org/member/members.tmpl	Adds search input + count display and a no-results state for the members list.
routers/web/org/members.go	Reads q, passes it into member queries, and persists query params in pagination.
models/organization/org.go	Adds keyword/email search filtering to org member queries via a user join.
models/organization/org_test.go	Adds tests validating org member search results and email privacy behavior.

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