feat: Add Line plugin (#1630)

* feat: add LINE plugin (#1630) (thanks @plum-dawg)

* feat: complete LINE plugin (#1630) (thanks @plum-dawg)

* chore: drop line plugin node_modules (#1630) (thanks @plum-dawg)

* test: mock /context report in commands test (#1630) (thanks @plum-dawg)

* test: limit macOS CI workers to avoid OOM (#1630) (thanks @plum-dawg)

* test: reduce macOS CI vitest workers (#1630) (thanks @plum-dawg)

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/line/bot-access.ts

@@ -0,0 +1,48 @@
+export type NormalizedAllowFrom = {
+  entries: string[];
+  hasWildcard: boolean;
+  hasEntries: boolean;
+};
+
+function normalizeAllowEntry(value: string | number): string {
+  const trimmed = String(value).trim();
+  if (!trimmed) return "";
+  if (trimmed === "*") return "*";
+  return trimmed.replace(/^line:(?:user:)?/i, "");
+}
+
+export const normalizeAllowFrom = (list?: Array<string | number>): NormalizedAllowFrom => {
+  const entries = (list ?? []).map((value) => normalizeAllowEntry(value)).filter(Boolean);
+  const hasWildcard = entries.includes("*");
+  return {
+    entries,
+    hasWildcard,
+    hasEntries: entries.length > 0,
+  };
+};
+
+export const normalizeAllowFromWithStore = (params: {
+  allowFrom?: Array<string | number>;
+  storeAllowFrom?: string[];
+}): NormalizedAllowFrom => {
+  const combined = [...(params.allowFrom ?? []), ...(params.storeAllowFrom ?? [])];
+  return normalizeAllowFrom(combined);
+};
+
+export const firstDefined = <T>(...values: Array<T | undefined>) => {
+  for (const value of values) {
+    if (typeof value !== "undefined") return value;
+  }
+  return undefined;
+};
+
+export const isSenderAllowed = (params: {
+  allow: NormalizedAllowFrom;
+  senderId?: string;
+}): boolean => {
+  const { allow, senderId } = params;
+  if (!allow.hasEntries) return false;
+  if (allow.hasWildcard) return true;
+  if (!senderId) return false;
+  return allow.entries.includes(senderId);
+};