Add VPS SSH key setup guide

VPS-SSH-KEY-SETUP.md

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+# SSH Key Setup for New VPS
+
+Quick guide to add your SSH private key to a new VPS and configure it for Gitea.
+
+## Step 1: Create .ssh Directory
+
+```bash
+mkdir -p ~/.ssh
+```
+
+## Step 2: Add Private Key
+
+Get your private key from 1Password and create the file:
+
+```bash
+cat > ~/.ssh/id_ed25519 << 'KEY'
+[PASTE YOUR ENTIRE PRIVATE KEY HERE - from -----BEGIN to -----END]
+KEY
+```
+
+## Step 3: Set Correct Permissions
+
+This is critical for SSH to work:
+
+```bash
+chmod 600 ~/.ssh/id_ed25519
+```
+
+This makes the key readable/writable by you only. SSH requires this for security.
+
+## Step 4: Start SSH Agent
+
+```bash
+eval "$(ssh-agent -s)"
+```
+
+You should see: Agent pid XXXXX
+
+## Step 5: Add Key to Agent
+
+```bash
+ssh-add ~/.ssh/id_ed25519
+```
+
+You should see: Identity added
+
+## Step 6: Test Connection
+
+```bash
+ssh -T git@100.120.125.113
+```
+
+Should respond with authentication success message.
+
+## Step 7: Make SSH Agent Persistent (Optional)
+
+Add to ~/.bashrc to avoid running the agent setup every time:
+
+```bash
+if ! pgrep -u "$USER" ssh-agent > /dev/null; then
+    eval "$(ssh-agent -s)" >> ~/.ssh/agent.env
+fi
+if [[ -f ~/.ssh/agent.env ]]; then
+    source ~/.ssh/agent.env
+fi
+```
+
+Then reload: source ~/.bashrc
+
+## Permissions Explained
+
+- chmod 600 = rw------- (read+write for owner only)
+- SSH requires this for security
+- Others cannot read your private key
+
+## Troubleshooting
+
+If still getting password prompts:
+```bash
+echo $SSH_AUTH_SOCK
+eval "$(ssh-agent -s)"
+ssh-add ~/.ssh/id_ed25519
+```
+
+If "Bad permissions" error:
+```bash
+chmod 600 ~/.ssh/id_ed25519
+chmod 700 ~/.ssh
+```
+
+## After SSH Works
+
+```bash
+bash <(curl -s http://100.120.125.113:3000/pdm/homelab-agents/raw/branch/main/scripts/bootstrap-agents.sh)
+init-project my-project
+```
+
+You can now use Gitea without passwords!