docs: add Quick Install (VS Code, Claude Code extension, install-all.sh); add install-all.sh fresh-machine setup script

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -36,9 +36,47 @@ sudo systemctl stop sshd && sudo systemctl disable sshd
 
 ---
 
+## ⚡ Quick Install (Fresh Machine)
+
+Do these three things in order. The script in step C runs Steps 2–14 and 16 of the Setup Guide below for you.
+
+### A — Install VS Code (manually)
+
+1. In a browser, go to https://code.visualstudio.com/download and download the **.deb** (Debian/Ubuntu) file
+2. Install it from a terminal:
+
+```sh
+sudo apt install -y ~/Downloads/code_*.deb
+
+# Verify
+code --version
+```
+
+### B — Add the Claude Code extension in VS Code
+
+1. Open VS Code
+2. Open the Extensions panel (`Ctrl+Shift+X`)
+3. Search for **Claude Code** (published by Anthropic) and click **Install**
+4. Click the Claude icon in the sidebar and sign in
+
+### C — Run the install script
+
+Clone the repository to `~/Desktop/DentalManagement09` if it isn't there yet (needs git: `sudo apt install -y git`), then run:
+
+```sh
+cd ~/Desktop/DentalManagement09
+bash install-all.sh
+```
+
+Enter your password when it asks. The script installs Node.js, Python, Chrome, PostgreSQL, Redis, rclone and nginx; installs the Node and Python dependencies; creates any missing `.env` files (existing ones are kept); sets up the database; and creates the desktop shortcuts. It is safe to re-run.
+
+Still done by hand afterwards: the Security Setup above, Step 1 (auto-login / keyring), Step 12a (Cloudflare subdomain), the LAN HTTPS certificate (the script only enables the nginx site once that certificate exists), and the optional Steps 17–18.
+
+---
+
 ## 🖥️ Setup Guide (Fresh Machine)
 
-Follow these steps in order after cloning the repository.
+Follow these steps in order after cloning the repository. (Steps 2–14 and 16 are automated by `install-all.sh` — see Quick Install above.)
 
 ### Step 1 — Enable auto-login (LXQt / SDDM)