Release 0.1.1: fix Node publish + bump everything

v0.1.0 reached crates.io, PyPI, and the wickra-wasm npm package, but
the wickra Node binding never published because the workflow called
`napi create-npm-dirs` (plural). The actual napi CLI command is
`create-npm-dir` (singular, per target).

Changes that make the next tag's release actually finish:

- workflow: replace the broken step with a loop that runs
  `napi create-npm-dir -t <triple>` for each of our four build targets.

- workflow: every registry publish step now treats "version already
  uploaded" as success. That makes re-runs (and partial-failure
  recoveries) safe instead of failing the whole job.

- bindings/node/package.json: trim the napi.triples list to the four
  platforms we actually build (linux-x64-gnu, darwin-x64, darwin-arm64,
  win32-x64-msvc). The previous defaults+9-extras configuration would
  have made napi prepublish expect platform packages we never produced.

- bindings/node/index.js: switch from local-only binary lookup to the
  proper napi loader that tries the local `.node` file first and falls
  back to the per-platform npm subpackage that's installed as an
  optional dependency in production.

- Versions across all four published packages bumped to 0.1.1 so the
  Node binding can publish for the first time alongside refreshed
  cargo/pypi/wasm artefacts.

Cargo.lock

@@ -1883,7 +1883,7 @@ dependencies = [
 
 [[package]]
 name = "wickra"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "approx",
  "criterion",
@@ -1894,7 +1894,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-core"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "approx",
  "proptest",
@@ -1904,7 +1904,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-data"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "approx",
  "csv",
@@ -1922,7 +1922,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-node"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "napi",
  "napi-build",
@@ -1932,7 +1932,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-python"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "numpy",
  "pyo3",
@@ -1941,7 +1941,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-wasm"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "console_error_panic_hook",
  "js-sys",