Fix real codegen bugs: unused proto import, missing runtime deps, no barrel index

protoc warned that print_job.proto imported template.proto without using it
- removed. ts-types/package.json was missing protobufjs and long, which the
ts-proto-generated code imports at runtime - tsc failed with 'cannot find
module'. src/index.ts also re-exports './generated' as a namespace, but
ts-proto wasn't configured to emit an index barrel file for it - added
outputIndex=true to the protoc invocation.

Verified with a clean 'bun run build' (both TS and Rust codegen) and
'tsc -b'.

package.json

@@ -6,7 +6,7 @@
     "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: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,outputIndex=true -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"