refactor: vwts_scraper — proper Python package structure

- Split single file into 8 focused modules (399 lines total):
  config.py — constants
  fetch.py — HTTP GET with retries
  paginate.py — page_count + HEAD verification
  parse.py — HTML parsing (topics, posts, tags)
  state.py — per-section state.json
  output.py — JSONL with file rotation
  run.py — main orchestration loop
  __main__.py — CLI entry point
- Run: python -m vwts_scraper <URL>
- Page count method fully tested (13 sections, 100+ topics, 0 errors)
- Resume support (Ctrl+C → state saved)
- Per-section state files (no conflicts between sections)

vwts_scraper/fetch.py

@@ -0,0 +1,33 @@
+"""HTTP-запросы: GET с ретраями, 404 без ретрая."""
+
+import time, logging
+from bs4 import BeautifulSoup
+import requests
+from .config import DELAY, TIMEOUT, HEADERS
+
+log = logging.getLogger(__name__)
+
+session = requests.Session()
+session.headers.update(HEADERS)
+
+
+def get(url: str) -> BeautifulSoup | None:
+    """GET + ретраи (до 3). 404 — без ретрая, сразу None."""
+    time.sleep(DELAY)
+    for n in range(3):
+        try:
+            r = session.get(url, timeout=TIMEOUT)
+            if r.status_code == 404:
+                log.warning(f"   ⏭️  404: {url[:80]}")
+                return None
+            if r.status_code in (403, 429, 503):
+                log.warning(f"⚠️  HTTP {r.status_code} — жду {10*(n+1)}с")
+                time.sleep(10 * (n + 1))
+                continue
+            r.raise_for_status()
+            return BeautifulSoup(r.text, "lxml")
+        except Exception as e:
+            log.warning(f"⚠️  Попытка {n+1}/3: {e}")
+            time.sleep(5)
+    log.error(f"❌ Не загружено: {url[:80]}")
+    return None