feat(auth): add interactive key policy editing

- Add auth policy to update existing authorized_keys allow policies locally or over remote serve.
- Support key lookup by public key or exact name, with safe, all, server-default, and category-based modes.
- Add questionary-powered interactive key selection and checkbox policy editing with current policy preselected.
- Show policy descriptions in auth keys output so each capability is easier to understand.
- Gate the new remote control command behind the existing keys policy category and include protocol routing/compat updates.
- Bump real-browser-cli to 0.16.2 and lock the new questionary dependency.
- Cover local, remote, validation, and policy-category behavior in tests.

uv.lock

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+version = "3.0.52"
+source = { registry = "https://pypi.org/simple" }
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 name = "pycparser"
 version = "3.0"
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+[[package]]
+name = "questionary"
+version = "2.1.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "prompt-toolkit" },
+]
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+]
+
 [[package]]
 name = "real-browser-cli"
-version = "0.16.0"
+version = "0.16.2"
 source = { editable = "." }
 dependencies = [
     { name = "click" },
     { name = "cryptography" },
     { name = "msgpack" },
+    { name = "questionary" },
     { name = "rich" },
 ]
 
@@ -491,6 +516,7 @@ requires-dist = [
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     { name = "cryptography", specifier = ">=48" },
     { name = "msgpack", specifier = ">=1" },
+    { name = "questionary", specifier = ">=2" },
     { name = "rich", specifier = ">=13" },
     { name = "zstandard", marker = "extra == 'fast'", specifier = ">=0.22" },
 ]
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