move the pty sidecar under src/servers/sidecar

it was the only sidecar living outside src/servers/sidecar/ — it sat in
api/terminal/ next to the bridge that talks to it, which is the one place a reader
looking for "the sidecars" would not check. now src/servers/sidecar/pty/index.mjs,
matching every peer, with a note on the pm2 entry about why this one is node and
.mjs (node-pty is a native addon) rather than bun and typescript like the rest.

the templates/ directory went to api/users/, next to provision.ts:seedShellConfigs,
which is now its only consumer — the sidecar's duplicate seeder went with the
sandbox branch in the previous commit. api/terminal/ is left holding exactly one
thing: the websocket bridge.

no behaviour change. the pm2 entry's script path changed, so `pm2 restart
officer-pty` is not enough — pm2 remembers the old path until the entry is deleted
and started again. commands are in SIDECAR_WORK_LOG.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/servers/api/users/templates/starship-officer.toml

@@ -0,0 +1,19 @@
+format = "${env_var.USER}:$hostname $directory $character"
+
+[env_var.USER]
+format = "[$env_value]($style)"
+style = "bold #0891B2"
+
+[hostname]
+ssh_only = false
+format = "[officer.dev]($style)"
+style = "bold yellow"
+
+[directory]
+truncation_length = 3
+truncate_to_repo = false
+style = "blue"
+
+[character]
+success_symbol = ">"
+error_symbol = ">"