Update git authentication and documentation

- Created ed25519 SSH key for git operations (secrets/ssh/ansible)
- Configured git to use SSH key authentication with IdentitiesOnly
- Recreated Gitea repository with proper SSH access (ID: 29)
- Added SSH agent auto-initialization script (.ssh-agent-init)
- Created comprehensive git SSH setup documentation
- Updated TODO.md to reflect resolved git push issues
- All git operations now use SSH key authentication

SSH Key Details:
- Passphrase: Documented in secrets/ssh/README.md
- Fingerprint: SHA256:mkgq5V567C/CJas9nbP16kNzzVqs7z7k2X90qdP0QXE
- Auto-load: source /opt/ansible/.ssh-agent-init

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.ssh-agent-init

@@ -0,0 +1,46 @@
+#!/bin/bash
+# SSH Agent initialization for ansible automation
+
+SSH_ENV="$HOME/.ssh/agent-env"
+ANSIBLE_KEY="/opt/ansible/secrets/ssh/ansible"
+
+function start_agent {
+    echo "Initializing new SSH agent..."
+    ssh-agent -s | sed 's/^echo/#echo/' > "${SSH_ENV}"
+    chmod 600 "${SSH_ENV}"
+    . "${SSH_ENV}" > /dev/null
+    
+    # Add ansible key
+    if [ -f "$ANSIBLE_KEY" ]; then
+        cat > /tmp/ansible-askpass.sh << 'ASKPASS'
+#!/bin/bash
+echo "PenguinsJuggleFlamingPineapples42"
+ASKPASS
+        chmod +x /tmp/ansible-askpass.sh
+        SSH_ASKPASS=/tmp/ansible-askpass.sh DISPLAY=:0 setsid -w ssh-add "$ANSIBLE_KEY" < /dev/null 2>/dev/null
+        rm -f /tmp/ansible-askpass.sh
+    fi
+}
+
+# Source SSH agent settings if exists
+if [ -f "${SSH_ENV}" ]; then
+    . "${SSH_ENV}" > /dev/null
+    ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
+        start_agent
+    }
+else
+    start_agent
+fi
+
+# Ensure ansible key is loaded
+if ! ssh-add -l 2>/dev/null | grep -q "ansible@mymx.me"; then
+    if [ -f "$ANSIBLE_KEY" ]; then
+        cat > /tmp/ansible-askpass.sh << 'ASKPASS'
+#!/bin/bash
+echo "PenguinsJuggleFlamingPineapples42"
+ASKPASS
+        chmod +x /tmp/ansible-askpass.sh
+        SSH_ASKPASS=/tmp/ansible-askpass.sh DISPLAY=:0 setsid -w ssh-add "$ANSIBLE_KEY" < /dev/null 2>/dev/null
+        rm -f /tmp/ansible-askpass.sh
+    fi
+fi