Add thread/shellCommand to app server API surface (#14988)

This PR adds a new `thread/shellCommand` app server API so clients can
implement `!` shell commands. These commands are executed within the
sandbox, and the command text and output are visible to the model.

The internal implementation mirrors the current TUI `!` behavior.
- persist shell command execution as `CommandExecution` thread items,
including source and formatted output metadata
- bridge live and replayed app-server command execution events back into
the existing `tui_app_server` exec rendering path

This PR also wires `tui_app_server` to submit `!` commands through the
new API.

codex-rs/app-server-protocol/schema/json/v2/ThreadShellCommandParams.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "properties": {
+    "command": {
+      "description": "Shell command string evaluated by the thread's configured shell. Unlike `command/exec`, this intentionally preserves shell syntax such as pipes, redirects, and quoting. This runs unsandboxed with full access rather than inheriting the thread sandbox policy.",
+      "type": "string"
+    },
+    "threadId": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "command",
+    "threadId"
+  ],
+  "title": "ThreadShellCommandParams",
+  "type": "object"
+}