feat: add manual known-word cache refresh path

- Add CLI command flag  with non-GUI dispatch flow and OSD error handling.

- Add runtime integration call and IPC hook so manual refresh works from command runner without app startup.

- Add public AnkiIntegration manual refresh API with force refresh semantics and guard reuse.

- Preserve default n+1 behavior by fixing config validation for malformed  values and adding tests.

src/cli/help.test.ts

@@ -17,4 +17,5 @@ test("printHelp includes configured texthooker port", () => {
 
   assert.match(output, /--help\s+Show this help/);
   assert.match(output, /default: 7777/);
+  assert.match(output, /--refresh-known-words/);
 });