chore: use camelCase for plugin names

Author: pkosiec

CLAUDE.md

@@ -172,7 +172,7 @@ AppKit uses a **phase-based plugin architecture** with three initialization phas
 import { Plugin, toPlugin } from '@databricks/appkit';
 
 class MyPlugin extends Plugin {
-  name: string = "my-plugin";
+  name: string = "myPlugin";
 
   // Validate required environment variables
   validateEnv() {

docs/docs/plugins.md

@@ -219,7 +219,7 @@ import { Plugin, toPlugin } from "@databricks/appkit";
 import type express from "express";
 
 class MyPlugin extends Plugin {
-  name = "my-plugin";
+  name = "myPlugin";
   envVars = [];                 // list required env vars here
 
   injectRoutes(router: express.Router) {
@@ -234,9 +234,9 @@ class MyPlugin extends Plugin {
   }
 }
 
-export const myPlugin = toPlugin<typeof MyPlugin, Record<string, never>, "my-plugin">(
+export const myPlugin = toPlugin<typeof MyPlugin, Record<string, never>, "myPlugin">(
   MyPlugin,
-  "my-plugin",
+  "myPlugin",
 );
 ```
 
@@ -276,7 +276,7 @@ Inside a Plugin subclass:
 
 ```ts
 const value = await this.cache.getOrExecute(
-  ["my-plugin", "data", userId],
+  ["myPlugin", "data", userId],
   async () => expensiveWork(),
   userKey,
   { ttl: 300 },