fix(flow-debugger): method pane takes structured parameters via ParameterValueForm + raw-JSON escape hatch (#37)

The Run-inbound-API-method pane rendered one text box per top-level schema
field and coerced the text on the page; an array/object field went through
JsonNode.Parse and, on failure, was SENT AS A STRING, while an empty box was
silently dropped. A required array-of-object parameter (MesMoveOut WorkOrders)
could not be entered at all — QA runs reached the site with "WorkOrders":[].

- The method pane now renders the same shared ParameterValueForm the script
  pane uses (typed inputs, nested groups, add/remove list item editors,
  $ref:lib: resolution, inline validation), keyed on the method id so a change
  of method remounts it. The page keeps ONE value tree and BuildParameters()
  serializes it as-is; the flat _inputs / Coerce() / SetInput path is deleted.
- Form | Raw JSON toggle: raw mode is a Monaco json editor for the whole
  request body, given the method's root schema for completion, parsed and
  schema-validated (InboundApiSchema.Validate) on every edit with the error
  inline. Entering raw mode seeds the editor from the tree; leaving it
  re-mounts the form over the last valid tree.
- Run is disabled while the form or the raw document is invalid (a required
  field left empty disables Run before the first keystroke).
- localStorage per-method entry stores the value tree; on restore it is
  validated against the schema and dropped if invalid, which also retires the
  pre-#37 flat string-per-field entries.
- ParameterValueForm.ToJsonSchema / JsonElementToObject made internal static
  for page reuse.
- Tests: 7 new bUnit tests (WorkOrders array-of-object round-trip to the
  RunMethodAsync payload, required list-item gating, invalid raw JSON blocks
  Run + shows parse/schema/non-object errors, valid raw JSON sent verbatim and
  survives the switch back to the form, method switch resets, persisted tree
  restored, legacy flat entry dropped); existing method-pane tests moved to
  the form's #param-<field> ids and fill the required field before Run.
  Playwright smoke selector moved to #param-Text.
- Docs: design doc, Component-CentralUI.md entry-points bullet, CLAUDE.md.

CentralUI.Tests 1425/1425 green; Playwright project builds.

Claude-Session: https://claude.ai/code/session_01XPsuy2ZZ5Gbyfpt8PrK5BV

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Shared/ParameterValueForm.razor

@@ -139,7 +139,7 @@ else
     /// placeholder (Type not in the JSON Schema set) collapses to a permissive
     /// <c>{}</c> so the editor still validates well-formed JSON without false errors.
     /// </summary>
-    private static string ToJsonSchema(InboundApiSchema schema)
+    internal static string ToJsonSchema(InboundApiSchema schema)
     {
         using var stream = new System.IO.MemoryStream();
         using (var writer = new System.Text.Json.Utf8JsonWriter(stream))
@@ -736,7 +736,7 @@ else
     private static string JoinField(string path, string field) =>
         string.IsNullOrEmpty(path) ? field : $"{path}.{field}";
 
-    private static object? JsonElementToObject(JsonElement element)
+    internal static object? JsonElementToObject(JsonElement element)
     {
         return element.ValueKind switch
         {