refactor(HAI-116): rename kb to hai across all packages, CLI, and docs

- Rename npm packages from @kb/* to @hai/* and update all workspace references
- Rename CLI binary from kb to hai and config directory from .kb to .hai
- Update dashboard UI branding, titles, and references from kb to hai
- Update all test files, CI workflows, and documentation to reflect new naming
- Run comprehensive grep verification to ensure no stale kb references remain

packages/dashboard/src/sse.ts

@@ -1,5 +1,5 @@
 import type { Request, Response } from "express";
-import type { TaskStore } from "@hai/core";
+import type { TaskStore } from "@kb/core";
 
 export function createSSE(store: TaskStore) {
   return (_req: Request, res: Response) => {