Revert PR #153 (instance-level 'member' → 'admin' rename)

[dangtony98]

Summary

Reverts #153, which renamed the instance-level role from member to admin on users, agents, invites, and user_invites. We're keeping the instance-level role name as member.

Pure git revert b608427 — restores Go server, CLI, web UI, tests, and docs to the pre-#153 wording, and deletes internal/store/migrations/044_instance_role_admin.sql from the source tree. No inverse migration is needed because nothing built on b608427 or later was ever distributed, so no DB has applied migration 044. Fresh installs from this branch run migrations …042 → 043 and stop there.

PR #155 (fresh-checkout go test fix) is preserved untouched — it only modified .gitignore and internal/server/webdist/.gitkeep, neither of which overlap with #153.

Test plan

• go test ./... passes (store, server, cmd)
• go build ./... clean
• Smoke: fresh install on this branch → schema matches pre-roles: rename instance-level 'member' to 'admin' #153 state
• Smoke: agent-vault user invite foo@bar.com defaults to member; --role owner still works; --role admin rejected
• Smoke: web invite-user / invite-agent dialogs show "Member" / "Owner"; toggle in users tab demotes owner → member (and is blocked for last owner)

[infisical-review-police]

💬 Discussion in Slack: #pr-review-agent-vault-156-revert-pr-153-instance-level-member-admin-rename

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