feat(practitioner): structură per-modul + PDF-uri sursă + split 2-PC

- audio/Modul {N}/filename.mp3 — fiecare modul în subdirector separat
  pentru copiere pe telefon și transfer între PC-uri.
- PDF-urile se păstrează ca sursă în summaries/pdf/ (fără extract txt).
- transcribe_status="pdf_source_only" pentru lecțiile PDF → summarize.py
  le filtrează automat.
- Fix coliziune manifest transcript_path (stem-based, nu preserve prior).
- .bat per modul (M2-M8) + dispatchers run_pc1_all (M2-M5) + run_pc2_all
  (M6-M8) pentru partajare work pe 2 PC-uri.
- prepare_pc2_bundle.py: zip cu scripts + manifest + .env + PDFs pentru
  PC2 (self-installs whisper.cpp/model/ffmpeg la primul run).
- M1 whisper complete (49/49 audio+vimeo transcrise).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

prepare_pc2_bundle.py

@@ -0,0 +1,73 @@
+"""
+Create a zip bundle for PC2 (runs M6-M8 transcription).
+Includes: scripts, manifest, credentials, docs. Excludes: large files.
+
+After unzipping on PC2:
+  1. Copy audio/Modul 6/, audio/Modul 7/, audio/Modul 8/ from PC1 into the
+     same relative path on PC2.
+  2. Run run_pc2_all.bat (auto-installs whisper.cpp + model + ffmpeg).
+
+Usage: .venv/Scripts/python.exe prepare_pc2_bundle.py
+Output: pc2_bundle.zip in current directory.
+"""
+import sys
+import zipfile
+from pathlib import Path
+
+sys.stdout.reconfigure(encoding="utf-8")
+
+FILES = [
+    "download.py",
+    "transcribe.py",
+    "summarize.py",
+    "courses.py",
+    "setup_whisper.py",
+    "md_to_pdf.py",
+    "retranscribe_tail.py",
+    "requirements.txt",
+    ".env",
+    "CLAUDE.md",
+    "run.bat",
+    "run_practitioner.bat",
+    "run_practitioner_M6.bat",
+    "run_practitioner_M7.bat",
+    "run_practitioner_M8.bat",
+    "run_pc2_all.bat",
+    "nlp-practitioner/manifest.json",
+]
+
+OUT = Path("pc2_bundle.zip")
+
+def main():
+    root = Path(".").resolve()
+    missing = [f for f in FILES if not (root / f).exists()]
+    if missing:
+        print("MISSING files, aborting:")
+        for f in missing:
+            print(f"  {f}")
+        return 1
+
+    with zipfile.ZipFile(OUT, "w", zipfile.ZIP_DEFLATED) as zf:
+        for f in FILES:
+            zf.write(root / f, arcname=f)
+            print(f"  added: {f}")
+
+        # Include PDF sources (user may want them on PC2 too, 7 MB total)
+        pdf_dir = root / "nlp-practitioner" / "summaries" / "pdf"
+        if pdf_dir.exists():
+            for pdf in sorted(pdf_dir.glob("*.pdf")):
+                arc = pdf.relative_to(root).as_posix()
+                zf.write(pdf, arcname=arc)
+                print(f"  added: {arc}")
+
+    size_mb = OUT.stat().st_size / 1_048_576
+    print(f"\nCreated {OUT} ({size_mb:.1f} MB)")
+    print(f"\nNext:")
+    print(f"  1. Copy {OUT.name} to PC2")
+    print(f"  2. On PC2: extract to a folder (e.g. D:/nlp-master)")
+    print(f"  3. Copy audio/Modul 6/, audio/Modul 7/, audio/Modul 8/ from PC1")
+    print(f"  4. Run: run_pc2_all.bat")
+    return 0
+
+if __name__ == "__main__":
+    raise SystemExit(main())