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/src/lib.rs

@@ -8,6 +8,27 @@ pub use continuum::v1::{
     MaterialProfile, PrintJob, PrintJobStatus, PrintParameters, Template,
 };
 
+// PrintJob.status is generated as a plain i32 (see build.rs's comment) -
+// (de)serialize it via PrintJobStatus's full proto name strings
+// (e.g. "PRINT_JOB_STATUS_QUEUED") so Rust's JSON matches ts-types'
+// TypeBox schema and protobuf's own canonical JSON enum mapping.
+mod print_job_status_serde {
+    use super::PrintJobStatus;
+    use serde::{Deserialize, Deserializer, Serialize, Serializer};
+
+    pub fn serialize<S: Serializer>(value: &i32, serializer: S) -> Result<S::Ok, S::Error> {
+        let status = PrintJobStatus::try_from(*value).unwrap_or(PrintJobStatus::Unspecified);
+        status.as_str_name().serialize(serializer)
+    }
+
+    pub fn deserialize<'de, D: Deserializer<'de>>(deserializer: D) -> Result<i32, D::Error> {
+        let name = String::deserialize(deserializer)?;
+        PrintJobStatus::from_str_name(&name)
+            .map(|status| status as i32)
+            .ok_or_else(|| serde::de::Error::custom(format!("unknown PrintJobStatus: {name}")))
+    }
+}
+
 // Bambu's raw MQTT command/report structs are NOT modeled here - they're
 // plain hand-written Rust + serde in continuum-proxy's
 // src/printer/bambu_commands/, not proto. That data is JSON-over-MQTT