Fix broken v2 bambulab schema refs, wire up v2 dispatchers, fix PrintJobStatus JSON mismatch

- v2/common/device/device.schema.json: stray backtick in bed $ref broke resolution
- v2/report/print/print.schema.json: ams $ref pointed at wrong path (missing ams/ subdir)
- v2/common/device/plate.schema.json: $id was copy-pasted from bed.schema.json
- Add v2/request.schema.json and v2/report.schema.json dispatchers - v2's leaf
  schemas were unreachable without them, same oneOf convention as v1
- Rewrite schemas/bambulab/README.md layout section, which still described
  v1's pre-rename paths and claimed v2 was removed
- PrintJob.status serialized as a raw i32 in Rust (prost stores proto3 enums
  as i32) while ts-types' TypeBox schema validates full enum name strings -
  add serde with= on the field so Rust JSON matches TS and protobuf's own
  canonical JSON enum mapping, plus a regression test

packages/rust-types/build.rs

@@ -21,6 +21,17 @@ fn main() {
     config.type_attribute(".", "#[derive(serde::Serialize, serde::Deserialize)]");
     config.type_attribute(".", "#[serde(rename_all = \"camelCase\")]");
 
+    // prost stores proto3 enums as plain `i32` fields (not the generated
+    // enum type), so the blanket type_attribute above never actually runs
+    // for `status` - it'd serialize as a bare number, disagreeing with
+    // TypeBox's full-name string literals in ts-types. Route the field
+    // through PrintJobStatus's own as_str_name()/from_str_name() instead,
+    // matching protobuf's own canonical JSON enum representation.
+    config.field_attribute(
+        ".continuum.v1.PrintJob.status",
+        "#[serde(with = \"crate::print_job_status_serde\")]",
+    );
+
     config
         .compile_protos(&proto_files, &[proto_root])
         .expect("failed to compile continuum .proto sources");