switch local dev to dedicated GitHub App + Clerk project (#347)

* update hookdeck source to github-dev for local development

Co-authored-by: Cursor <cursoragent@cursor.com>

* use GITHUB_APP_SLUG env var for install URLs instead of hardcoded slug

Co-authored-by: Cursor <cursoragent@cursor.com>

* replace GITHUB_TOKEN alias hack with ensureGitHubToken in vitest setup

Co-authored-by: Cursor <cursoragent@cursor.com>

* add neon CLI reference wiki page

Co-authored-by: Cursor <cursoragent@cursor.com>

* use select_target for GitHub App install URL to show account picker

Co-authored-by: Cursor <cursoragent@cursor.com>

* scope repo listing to installation access and invalidate paged cache

when repository_selection is "selected", use the REST installation repos
list instead of the unscoped GraphQL repositoryOwner query. also filter
active repos against the allowed set. add getInstallationReposPage cache
invalidation alongside existing getInstallationRepos invalidation in
webhooks and the GitHub App callback.

Co-authored-by: Cursor <cursoragent@cursor.com>

* clear getUserInstallations cache on repo add/remove webhooks

repository_selection changes (e.g. "all" -> "selected") trigger
repositories_added/removed events, so the installation metadata
cache must be refreshed to pick up the new selection mode.

Co-authored-by: Cursor <cursoragent@cursor.com>

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Co-authored-by: Cursor <cursoragent@cursor.com>

vitest.setup.ts

@@ -1,9 +1,7 @@
 import { resolve } from "node:path";
 import { config } from "dotenv";
+import { ensureGitHubToken } from "./utils/github.ts";
 
 config({ path: resolve(import.meta.dirname, "../.env") });
 
-// alias GITHUB_TOKEN to GH_TOKEN for tests
-if (!process.env.GH_TOKEN && process.env.GITHUB_TOKEN) {
-  process.env.GH_TOKEN = process.env.GITHUB_TOKEN;
-}
+await ensureGitHubToken();