fix(ci): drop --frozen-lockfile from bun install

The committed bun.lock predates the recent package.json updates (name,
metadata, removal of dangling lint/test scripts), and the active Nx
migration leaves bun.lock further out of sync locally. --frozen-lockfile
makes CI hard-fail on any drift, which blocked installs.

Use plain `bun install` until the Nx migration lands and the lockfile
is refreshed in a dedicated commit.

Author: Confitty Developer

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
             ${{ runner.os }}-bun-
 
       - name: Install dependencies
-        run: bun install --frozen-lockfile
+        run: bun install
 
       - name: Type check
         run: bun run typecheck