feat: right-click menus in Files/Users/Artifacts; several SSH keys and accounts per host

- Files: right-click a sidebar workspace (Open, Copy path) or home (Open,
  Open Trash), a path crumb (Open, Download as zip, Paste into, Copy path),
  a Trash row (Restore, Copy path, Delete forever), the Trash area (Refresh,
  Empty Trash) and an admin's per-user Trash folder (Open, Empty Trash).
- Users: row menu (Edit + Open home in Files for an admin, Copy username/email).
- Artifacts: card menu repeating its buttons, plus Copy link for a page.
- Git identity: named SSH keys beside the default ones (id_<type>_<name>,
  max 10, DELETE ?id=); SSH logins per alias (`ssh://<alias>/` →
  `ssh://<user>@<host>/`, so several AWS CodeCommit accounts share a host),
  each optionally tied to one key (`agenthub.<from>.sshKey`) — a clone of
  that URL offers only that key and persists it. Terminal sshCommand follows
  the keys. Settings → Git: "More SSH keys" + account name/key in the AWS and
  other-host forms. Docs/API.md, OpenAPI updated.

client/src/lib/api.ts

@@ -2720,22 +2720,30 @@ export const api = {
      * Make the SSH key; `replace` swaps an existing one for a new pair.
      * `type`: ed25519 (default) or rsa (RSA 4096 — AWS CodeCommit takes only RSA).
      */
-    generateKey: (replace = false, type: "ed25519" | "rsa" = "ed25519") =>
+    generateKey: (replace = false, type: "ed25519" | "rsa" = "ed25519", name?: string) =>
       request<GitIdentity>("/me/git/ssh-key", {
         method: "POST",
-        body: JSON.stringify({ replace, type }),
+        body: JSON.stringify(name ? { replace, type, name } : { replace, type }),
       }),
-    /** DELETE /api/me/git/ssh-key — the key of `type`, or every key. */
+    /** DELETE /api/me/git/ssh-key — the default key of `type`, or every key. */
     removeKey: (type?: "ed25519" | "rsa") =>
       request<GitIdentity>(`/me/git/ssh-key${type ? `?type=${type}` : ""}`, { method: "DELETE" }),
+    /** DELETE /api/me/git/ssh-key?id= — one key by its id (a named one). */
+    removeKeyById: (id: string) =>
+      request<GitIdentity>(`/me/git/ssh-key?id=${encodeURIComponent(id)}`, { method: "DELETE" }),
     /** PUT /api/me/git/ssh-terminal — use the key for git typed in the account's terminal. */
     setTerminalSsh: (on: boolean) =>
       request<GitIdentity>("/me/git/ssh-terminal", { method: "PUT", body: JSON.stringify({ on }) }),
-    /** PUT /api/me/git/ssh-user — the SSH login name for a host (CodeCommit: the SSH key ID). */
-    setSshUser: (body: { host: string; user: string }) =>
+    /**
+     * PUT /api/me/git/ssh-user — an SSH login (CodeCommit: the SSH key ID as
+     * the user): for the host itself, or with `alias` one more account on it
+     * (`ssh://<alias>/…`); `key` = the only key it uses.
+     */
+    setSshUser: (body: { host: string; user: string; alias?: string; key?: string }) =>
       request<GitIdentity>("/me/git/ssh-user", { method: "PUT", body: JSON.stringify(body) }),
-    removeSshUser: (host: string) =>
-      request<GitIdentity>(`/me/git/ssh-user/${encodeURIComponent(host)}`, { method: "DELETE" }),
+    /** DELETE a login by its host (the host's own rule) or its alias. */
+    removeSshUser: (from: string) =>
+      request<GitIdentity>(`/me/git/ssh-user/${encodeURIComponent(from)}`, { method: "DELETE" }),
     saveHttps: (body: { host: string; username: string; password: string }) =>
       request<GitIdentity>("/me/git/https", { method: "POST", body: JSON.stringify(body) }),
     removeHttps: (host: string) =>
@@ -4266,12 +4274,25 @@ export interface GitIdentity {
     /** Whether a plain `git` in the account's terminal uses the key (`~/.gitconfig` core.sshCommand); `foreign` = the user set their own. */
     terminal?: "on" | "off" | "foreign";
   } | null;
-  /** Every key the account holds (ED25519 first); absent from an older server. */
-  sshKeys?: { type?: "ed25519" | "rsa"; publicKey: string; fingerprint: string }[];
+  /**
+   * Every key the account holds: the default ED25519 and RSA first, then the
+   * named ones (`name`; `id` = its file name); absent from an older server.
+   */
+  sshKeys?: {
+    id?: string;
+    type?: "ed25519" | "rsa";
+    name?: string | null;
+    publicKey: string;
+    fingerprint: string;
+  }[];
   /** The terminal switch (shared by both keys); null without a key. */
   sshTerminal?: "on" | "off" | "foreign" | null;
-  /** SSH login name per host (`url.<…>.insteadOf` in `~/.gitconfig`); absent from an older server. */
-  sshUsers?: { host: string; user: string }[];
+  /**
+   * SSH logins (`url.<…>.insteadOf` in `~/.gitconfig`): `alias` null = the
+   * host's own (`ssh://<host>/`), else `ssh://<alias>/`; `key` = the one key
+   * it uses, null = every key. Absent from an older server.
+   */
+  sshUsers?: { host: string; user: string; alias?: string | null; key?: string | null }[];
   /** The account's commit author (`git config --global`); null fields = unset. */
   author: { name: string | null; email: string | null };
   /** The suggested email while none is set: `<username>@smartgift.vn`. */