Initial boilerplate scaffold for continuum-schemas

Protobuf data model (Template/PrintJob/MaterialProfile/PrintParameters)
with codegen targets for TypeBox+TS types (packages/ts-types) and
prost-derived Rust structs (packages/rust-types).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "continuum-schemas",
+  "version": "0.1.0",
+  "private": true,
+  "workspaces": [
+    "packages/*"
+  ],
+  "scripts": {
+    "build:ts": "protoc --plugin=protoc-gen-ts_proto=./node_modules/.bin/protoc-gen-ts_proto --ts_proto_out=packages/ts-types/src/generated --ts_proto_opt=esModuleInterop=true,outputServices=false,useOptionals=messages -I proto $(find proto -name '*.proto')",
+    "build:rust": "cargo build -p continuum-rust-types --manifest-path packages/rust-types/Cargo.toml",
+    "build": "npm run build:ts && npm run build:rust",
+    "typecheck": "tsc -b"
+  },
+  "devDependencies": {
+    "ts-proto": "^1.181.0",
+    "typescript": "^5.5.0"
+  }
+}