feat(schema-form): schema-driven React form renderer package

@deepseek-ai/dsh-client-schema-form rehydrates the wire's serialized
schemastery envelope (new Schema(json)) and edits a draft user section
against it: presence-in-draft marks a field overridden with a per-field
reset, inherited values render as placeholders, role('secret') slots are
write-only with configured-state placeholders from the wire's secrets
list, dict adds take a union-typed sKey as their vocabulary, and any
node the renderer cannot faithfully edit falls back to a read-only view
instead of silently disappearing. renderField(context) is the role hook
the Models page will use for the credential-ref control; validateDraft
runs the same rehydrated validator the host uses, so the browser and
host judge one schema.

tsconfig.client.json

@@ -28,6 +28,7 @@
     // so it cannot drag host-side Context augmentation into this program.
     { "path": "./packages/host/webserver" },
     { "path": "./packages/client/ui-slots" },
+    { "path": "./packages/client/schema-form" },
     { "path": "./packages/client/ui-primitives" },
     { "path": "./packages/client/web-react" },
     { "path": "./packages/client/modules" },