feat: fixed exit proxy (last hop only), optional pool-free single-hop mode, gitignore pycache

Made-with: Cursor

README.md

@@ -14,6 +14,7 @@ YOU → NordVPN (OS tunnel) → Hop 1 → Hop 2 → Hop 3 → Internet
 - **Multi-hop GOST chains** — 2–8 hops, randomly picked from validated pool
 - **Obfuscation modes** — Auto, HTTP-only, SOCKS5-only, Random Mix
 - **Manual chain builder** — drag/reorder hops, pin your own IPs
+- **Fixed exit (last hop)** — optional URL used only as the final hop; earlier hops still rotate randomly (ignored when a full manual chain is pinned)
 - **Exit IP verification** — checks real exit IP every health cycle, rotates if it matches your real IP
 - **Windows system proxy** — sets `HKCU` registry proxy so all WinINet apps use the chain
 - **Firewall kill-switch** — `netsh` rules that block all outbound except GOST + NordVPN when running as Admin
@@ -73,7 +74,8 @@ Output: `dist\ProxyChainManager.exe` + copied to Desktop.
 ## Chain Builder Tab
 
 - **Obfuscation mode** — selects which protocols to include in chains
-- **Hop count slider** — 2–8 hops
+- **Hop count slider** — 1–8 total hops (top bar ± or slider)
+- **Fixed exit (last hop only)** — optional field: your SOCKS/HTTP proxy is always the **last** hop before the internet; all **earlier** hops are still chosen at random from the validated pool. Leave empty for a fully automatic chain. Set hop count to `1` to use **only** your fixed exit (no pool). While **Pin & use this chain** is on, the full pinned list wins and fixed exit is ignored.
 - **Manual chain** — enter proxies manually, reorder with ↑↓, enable "Use this chain" to pin it
 - **Paste current** — copies the auto-selected chain into the editor
 - **Sources** — add/remove proxy list URLs (JSON format from Proxifly)