refactor(pdf-compress): replace Ghostscript with qpdf + iLovePDF API

Ghostscript -sDEVICE=pdfwrite fundamentally re-encodes fonts, causing
garbled text regardless of parameters. This cannot be fixed.

New approach:
- Local: qpdf-only lossless structural optimization (5-30% savings,
  zero corruption risk — fonts and images completely untouched)
- Cloud: iLovePDF API integration (auth → start → upload → process →
  download) with 3 levels (recommended/extreme/low), proper image
  recompression without font corruption

Frontend: 3 modes (cloud recommended, cloud extreme, local lossless).
Docker: ILOVEPDF_PUBLIC_KEY env var added.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/modules/mini-utilities/components/mini-utilities-module.tsx

@@ -1638,7 +1638,7 @@ function formatBytes(bytes: number) {
 
 function PdfReducer() {
   const [file, setFile] = useState<File | null>(null);
-  const [mode, setMode] = useState<"extreme" | "max" | "balanced">("extreme");
+  const [mode, setMode] = useState<"cloud-extreme" | "cloud-recommended" | "local">("cloud-recommended");
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState("");
   const [result, setResult] = useState<{
@@ -1662,10 +1662,21 @@ function PdfReducer() {
     try {
       const formData = new FormData();
       formData.append("fileInput", file);
-      // All modes use the GS endpoint with a level parameter
-      formData.append("level", mode === "extreme" ? "extreme" : mode === "max" ? "high" : "balanced");
 
-      const res = await fetch("/api/compress-pdf/extreme", {
+      let endpoint: string;
+      if (mode === "local") {
+        // qpdf-only: lossless structural optimization
+        endpoint = "/api/compress-pdf/extreme";
+      } else {
+        // iLovePDF cloud compression
+        endpoint = "/api/compress-pdf/cloud";
+        formData.append(
+          "level",
+          mode === "cloud-extreme" ? "extreme" : "recommended",
+        );
+      }
+
+      const res = await fetch(endpoint, {
         method: "POST",
         body: formData,
       });
@@ -1755,22 +1766,26 @@ function PdfReducer() {
         <select
           value={mode}
           onChange={(e) =>
-            setMode(e.target.value as "extreme" | "max" | "balanced")
+            setMode(e.target.value as "cloud-extreme" | "cloud-recommended" | "local")
           }
           className="mt-1 w-full rounded-md border bg-background px-3 py-2 text-sm"
         >
-          <option value="extreme">
-            Extremă — imagini 100 DPI, calitate scăzută
+          <option value="cloud-recommended">
+            ☁️ iLovePDF — compresie recomandat
+          </option>
+          <option value="cloud-extreme">
+            ☁️ iLovePDF — compresie extremă
+          </option>
+          <option value="local">
+            💻 Local — optimizare structurală (fără pierderi)
           </option>
-          <option value="max">Puternică — imagini 150 DPI, calitate medie (recomandat)</option>
-          <option value="balanced">Echilibrată — imagini 200 DPI, calitate bună</option>
         </select>
         <p className="text-xs text-muted-foreground">
-          {mode === "extreme"
-            ? "Reduce maxim dimensiunea. Imaginile pot pierde detalii fine."
-            : mode === "max"
-              ? "Balanță bună între dimensiune și calitate. Recomandat pentru majoritatea fișierelor."
-              : "Pierdere minimă de calitate. Ideal pentru documente cu grafice detaliate."}
+          {mode === "cloud-recommended"
+            ? "Compresie cloud cu calitate bună. Reduce semnificativ imaginile păstrând lizibilitatea."
+            : mode === "cloud-extreme"
+              ? "Compresie maximă cloud. Imagini reduse agresiv — ideal pentru arhivare."
+              : "Optimizare locală cu qpdf (lossless). Zero pierdere de calitate, reducere 5-30%."}
         </p>
       </div>