ci: remove duplicate server-ci workflow (#870)

The matrix in CI / server-tests (ci.yml) covers what Server CI / test was
doing, on Linux and Windows instead of Linux only. Two workflows running
the same test suite on every server-touching PR is wasted runner time.

.github/workflows/server-ci.yml

@@ -1,55 +0,0 @@
-name: Server CI
-
-on:
-  push:
-    branches: [main]
-    paths:
-      - "packages/server/**"
-      - "package.json"
-      - "package-lock.json"
-      - ".github/workflows/server-ci.yml"
-  pull_request:
-    branches: [main]
-    paths:
-      - "packages/server/**"
-      - "package.json"
-      - "package-lock.json"
-      - ".github/workflows/server-ci.yml"
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - uses: actions/setup-node@v4
-        with:
-          node-version: "22"
-          cache: "npm"
-
-      - name: Fetch origin/main (worktree tests)
-        run: git fetch --no-tags origin main:refs/remotes/origin/main
-
-      - name: Install server dependencies
-        run: npm ci --workspace=@getpaseo/server --include-workspace-root
-
-      - name: Install Claude Code CLI for provider tests
-        run: npm install -g @anthropic-ai/claude-code
-
-      - name: Build highlight dependency
-        run: npm run build --workspace=@getpaseo/highlight
-
-      - name: Build relay dependency
-        run: npm run build --workspace=@getpaseo/relay
-
-      - name: Typecheck
-        run: npm run typecheck --workspace=@getpaseo/server
-
-      - name: Test
-        run: npm run test --workspace=@getpaseo/server
-        env:
-          CLAUDE_CODE_OAUTH_TOKEN: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
-          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}