refactor(infra): remove proxy-stripping sed from setup.sh — Dockerfiles are clean at source

docs/devops/single_azure_vm/setup.sh

@@ -289,26 +289,9 @@ phase3_clone() {
     fi
   done
 
-  # ── Strip corporate proxy from Dockerfiles ──────────────────────────
-  # Product Dockerfiles have hardcoded AT&T corporate proxy ENVs that
-  # would break builds on any non-corporate network (including Azure VMs).
-  # Strip them since we don't need a proxy on the VM.
-  log "  Stripping corporate proxy from Dockerfiles..."
-  local patched=0
-  for df in "${INSTALL_DIR}"/*/backend/Dockerfile "${INSTALL_DIR}"/*/web/Dockerfile "${INSTALL_DIR}"/learning_multimodal_memory_agents/mindlyst-native/web/Dockerfile "${INSTALL_DIR}"/learning_voice_ai_agent/user-dashboard-web/Dockerfile; do
-    [ -f "$df" ] || continue
-    if grep -q 'cso\.proxy\.att\.com' "$df" 2>/dev/null; then
-      sed -i \
-        -e '/HTTP_PROXY=http:\/\/cso\.proxy/d' \
-        -e '/HTTPS_PROXY=http:\/\/cso\.proxy/d' \
-        -e '/NO_PROXY=/d' \
-        -e '/jfrog-pkg-proxy.*\\$/d' \
-        -e 's| && npm config set registry https://jfrog-pkg-proxy[^ ]*||' \
-        "$df"
-      patched=$((patched + 1))
-    fi
-  done
-  ok "  Patched ${patched} Dockerfiles (removed corporate proxy)."
+  # NOTE: Corporate proxy was removed from all Dockerfiles at source
+  # (commit fix(docker) across all 10 product repos + dashboards).
+  # No runtime sed stripping needed.
 
   ok "Phase 3 complete. All repos in ${INSTALL_DIR}/"
 }