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

schemas/bambulab/v2/request.schema.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.octoturge.com/Continuum/continuum-schemas/raw/branch/main/schemas/bambulab/v2/request.schema.json",
+  "title": "BambuRequestV2",
+  "description": "V2 equivalent of v1/request.schema.json - one JSON key naming the category, each a oneOf to leave room for more than one request shape per category. Only wires categories that actually have a v2 schema on disk; add a property here when a new v2/request/<category>/ schema is added.",
+  "type": "object",
+  "minProperties": 1,
+  "maxProperties": 1,
+  "properties": {
+    "info": {
+      "oneOf": [
+        { "$ref": "request/info/get_version.schema.json" }
+      ]
+    }
+  },
+  "additionalProperties": false
+}