feat(render+node-agent+admin): install fonts on all render nodes + verify

Push a font once → every node installs it → admin sees per-node status.

- render-svc: font_requests + node_fonts tables (mig 25); admin GET/POST/DELETE
  /v1/node-fonts (with per-node status matrix); internal (HMAC) GET pending +
  POST status for node-agents
- node-agent: fontSyncLoop polls pending fonts every 60s, downloads, installs
  (Windows Fonts dir + registry / macOS / linux fc-cache), reports Installed/Failed
- gateway: /v1/node-fonts/* → render
- admin /admin/node-fonts: upload a .ttf/.otf → install on all nodes; per-node
  Installed/Pending/Failed badges + counts + delete

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/node-agent/internal/runner/fonts.go

@@ -0,0 +1,92 @@
+package runner
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+// InstallFont downloads a font file and installs it into the OS so After Effects
+// can use it. Returns nil on success. Best-effort per platform.
+func InstallFont(ctx context.Context, fileURL, name string) error {
+	ext := filepath.Ext(strings.Split(fileURL, "?")[0])
+	if ext == "" {
+		ext = ".ttf"
+	}
+	fileName := sanitizeFontName(name) + ext
+
+	tmpDir, err := os.MkdirTemp("", "fr-font-")
+	if err != nil {
+		return fmt.Errorf("tmp dir: %w", err)
+	}
+	defer os.RemoveAll(tmpDir)
+	tmp := filepath.Join(tmpDir, fileName)
+	if _, err := DownloadFile(ctx, fileURL, tmp); err != nil {
+		return fmt.Errorf("download: %w", err)
+	}
+
+	switch runtime.GOOS {
+	case "windows":
+		return installFontWindows(ctx, tmp, fileName)
+	case "darwin":
+		return copyFile(tmp, filepath.Join(os.Getenv("HOME"), "Library", "Fonts", fileName))
+	default: // linux
+		dir := filepath.Join(os.Getenv("HOME"), ".local", "share", "fonts")
+		_ = os.MkdirAll(dir, 0o755)
+		if err := copyFile(tmp, filepath.Join(dir, fileName)); err != nil {
+			return err
+		}
+		_ = exec.CommandContext(ctx, "fc-cache", "-f").Run()
+		return nil
+	}
+}
+
+func installFontWindows(ctx context.Context, src, fileName string) error {
+	// Prefer the machine-wide Fonts dir; fall back to the per-user dir.
+	dst := filepath.Join(os.Getenv("WINDIR"), "Fonts", fileName)
+	if err := copyFile(src, dst); err != nil {
+		userFonts := filepath.Join(os.Getenv("LOCALAPPDATA"), "Microsoft", "Windows", "Fonts")
+		_ = os.MkdirAll(userFonts, 0o755)
+		dst = filepath.Join(userFonts, fileName)
+		if err := copyFile(src, dst); err != nil {
+			return fmt.Errorf("copy font: %w", err)
+		}
+	}
+	// Register so Windows/AE pick it up without a reboot (best-effort; needs admin).
+	_ = exec.CommandContext(ctx, "reg", "add",
+		`HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts`,
+		"/v", fileName, "/t", "REG_SZ", "/d", dst, "/f").Run()
+	return nil
+}
+
+func copyFile(src, dst string) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+	if _, err := io.Copy(out, in); err != nil {
+		return err
+	}
+	return out.Sync()
+}
+
+func sanitizeFontName(s string) string {
+	s = strings.TrimSpace(s)
+	repl := strings.NewReplacer("/", "_", "\\", "_", ":", "_", "*", "_", "?", "_", "\"", "_", "<", "_", ">", "_", "|", "_", " ", "_")
+	s = repl.Replace(s)
+	if s == "" {
+		return "font"
+	}
+	return s
+}