fix: deploy script — replace broken bun --cwd with subshell cd for VPS build

The 'bun --cwd apps/web run build' on VPS was silently failing —
bun doesn't support --cwd flag, printed usage, exited 0. Then on
the GitHub runner, turbo couldn't find package manager binary.
Fix: use 'cd apps/web && bun run build && cd ..' in SSH script.
CI build step also uses turbo --filter for proper workspace isolation.

.github/workflows/deploy.yml

@@ -46,7 +46,7 @@ jobs:
             cd /home/code/mcpedia
             git pull origin main
             /home/code/.bun/bin/bun install --frozen-lockfile
-            /home/code/.bun/bin/bun run build --filter=@mcpedia/web
+            cd apps/web && /home/code/.bun/bin/bun run build && cd /home/code/mcpedia
             /home/code/.bun/bin/bun run scripts/indexer.ts
             sudo systemctl restart mcpedia-web mcpedia-api mcpedia-mcp mcpedia-worker
             sleep 3