fix(dx): suppress AZURE_OPENAI_API_KEY warning, honest db:push reporting

- docker-compose: add empty default for AZURE_OPENAI_API_KEY to suppress
  Docker Compose "variable is not set" warning
- setup-databases.sh: detect when pnpm filter matches no packages and
  report "Skipped" instead of false "Schema pushed" success

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/setup-databases.sh

@@ -55,7 +55,12 @@ push_schema() {
     local filter=$1
     local name=$2
     echo -e "${YELLOW}Pushing schema for ${name}...${NC}"
-    if pnpm --filter "$filter" db:push --force 2>/dev/null; then
+    local output
+    output=$(pnpm --filter "$filter" db:push --force 2>&1)
+    local exit_code=$?
+    if echo "$output" | grep -q "No projects matched the filters\|None of the selected packages has"; then
+        echo -e "  ${YELLOW}⊘ Skipped (no db:push script for ${filter})${NC}"
+    elif [ $exit_code -eq 0 ]; then
         echo -e "  ${GREEN}✓ Schema pushed${NC}"
     else
         echo -e "  ${RED}✗ Failed (may not have db:push script)${NC}"