Fix broken $refs from the bambulab schema underscore-rename, remove stale v2/

- print.schema.json, _ams.schema.json, _ams_unit.schema.json still
  pointed at the pre-rename filenames (ams.schema.json, ams_unit.schema.json,
  ams_tray.schema.json) after the underscore-prefix split - fixed all
  three, verified with a full jsonschema + referencing validation run
  against real captures (get_version, pushall, a full print/ams/xcam
  report with both empty and loaded trays) plus negative tests.
- _upgrade_state.schema.json: fixed its $id (pointed at report/info/,
  file lives under report/print/) and its title (said "ModuleInfo",
  clearly copy-pasted from _module_info.schema.json). Wired it into
  print.schema.json as the print report's `upgrade_state` property -
  the file existed but nothing referenced it yet.
- Deleted schemas/bambulab/v2/, which had been recreated as stale,
  broken copies of an older v1 (missing the envelope allOf, missing
  the underscore renames, $ids still pointing at v1/ paths) - the
  repo's own README documents v2 as intentionally removed until V2's
  wire format is known to differ from V1's.
- Updated schemas/bambulab/README.md's layout tree and inheritance-
  example reference, both stale after the underscore rename.
- Removed stray tsc -b build output (packages/ts-types/src/*.d.ts/js)
  that isn't meant to be committed (outDir is dist/, gitignored).

Verified: cargo check clean (continuum-proxy, continuum-ai-worker,
rust-types), tsc clean (continuum-backend, continuum-common ts-core),
10/10 JSON Schema validation cases passing.

schemas/bambulab/v1/report/print/_vt_tray.schema.json

@@ -0,0 +1,36 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.octoturge.com/Continuum/continuum-schemas/raw/branch/main/schemas/bambulab/v1/report/print/_vt_tray.schema.json",
+  "title": "VtTray",
+  "description": "This schema is used as Virtual Tray (external spool) or as a base for AmsTray. When empty, all values are zeroed and `tray_color` field is set to \"FFFFFF00\".",
+  "type": "object",
+  "properties": {
+    "id": { "type": "string" },
+    "tag_uid": { "type": "string" },
+    "tray_id_name": { "type": "string" },
+    "tray_info_idx": { "type": "string" },
+    "tray_type": { "type": "string" },
+    "tray_sub_brands": { "type": "string" },
+    "tray_color": { "type": "string" },
+    "tray_weight": { "type": "string" },
+    "tray_diameter": { "type": "string" },
+    "tray_temp": { "type": "string" },
+    "tray_time": { "type": "string" },
+    "bed_temp_type": { "type": "string" },
+    "bed_temp": { "type": "string" },
+    "nozzle_temp_min": { "type": "string" },
+    "nozzle_temp_max": { "type": "string" },
+    "xcam_info": { "type": "string" },
+    "tray_uuid": { "type": "string" },
+    "remain": { "type": "integer", "minimum": 0 },
+    "k": { "type": "number" },
+    "n": { "type": "number" },
+    "cali_idx": { "type": "number" }
+  },
+  "required": [
+    "id", "remain", "bed_temp", "bed_temp_type",
+    "nozzle_temp_max", "nozzle_temp_min", "tag_uid", "tray_color",
+    "tray_diameter", "tray_id_name", "tray_info_idx", "tray_sub_brands",
+    "tray_type", "tray_uuid", "tray_weight", "xcam_info", "k", "n"
+  ]
+}