[P1] selectors: extract permissions / subjects / connected-sites selectors

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**Parent Epic:** [#44566 — `selectors.js` decomposition](https://github.com/MetaMask/metamask-extension/issues/44566)
**Source:** `ui/selectors/selectors.js`
**Size:** L

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## Problem

~35 permission/subject/connected-site selectors (`getPermissionSubjects`, `getSubjectMetadata`, `getTargetSubjectMetadata`, `getAllPermittedAccounts*`, `getPermittedEVMChainsForSelectedTab`, `getConnectedSitesList*`, `getPermissionsForActiveTab`, `getOriginOfCurrentTab`, …) **plus the connected-account-list selectors** (`getUnconnectedAccounts`, `getOrderedConnectedAccountsForActiveTab`, `getUpdatedAndSortedAccounts*`). Highest coupling: imports accounts + network + approvals; owns the subject/metadata base that snaps reuses. `permissions.test.js` already exists.

## Solution

Create `ui/selectors/permissions.ts` (after accounts + network). **Place the connected-account-list selectors here** (one-way permissions→accounts) to break the accounts↔permissions cycle. This module owns the subject/metadata base — extract before `snaps`.

Migration seam (no barrel): repoint every site importing the moved selectors to `ui/selectors/` directly (a `ts-morph` codemod that splits any `../selectors` barrel imports into per-module imports) and delete them from `selectors.js` in the same PR — no re-export facade, per the no-barrel-files convention.

## Acceptance Criteria

- [ ] `permissions.ts` incl. connected-account lists + subject/metadata base; no require cycle with `accounts.ts`; imports repointed directly to the module (no barrel); pairs with existing test. Tests green.

Start with ui/selectors/selectors.js and the existing permissions.test.js, then identify the listed permission, subject, connected-site, and connected-account selectors and their importing sites. Move them into ui/selectors/permissions.ts, repoint imports directly, and verify there is no require cycle with accounts.ts and that the tests are green.

Written by the indexing model from the issue text.