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/_xcam.schema.json

@@ -0,0 +1,20 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.octoturge.com/Continuum/continuum-schemas/raw/branch/main/schemas/bambulab/v1/report/print/_xcam.schema.json",
+  "title": "XcamSettings",
+  "description": "Camera-based AI print monitoring settings (spaghetti detection, first-layer inspection, etc.).",
+  "type": "object",
+  "properties": {
+    "allow_skip_parts": { "type": "boolean" },
+    "buildplate_marker_detector": { "type": "boolean" },
+    "first_layer_inspector": { "type": "boolean" },
+    "halt_print_sensitivity": { "type": "string" },
+    "print_halt": { "type": "boolean" },
+    "printing_monitor": { "type": "boolean" },
+    "spaghetti_detector": { "type": "boolean" }
+  },
+  "required": [
+    "allow_skip_parts", "buildplate_marker_detector", "first_layer_inspector",
+    "halt_print_sensitivity", "print_halt", "printing_monitor", "spaghetti_detector"
+  ]
+}