Add comprehensive project shortcuts system

- Create config/projects.nix for project definitions with templates
- Add scripts/templates/ with basic, content, and research workflows
- Create universal project-launcher.sh for template execution
- Integrate project system into zsh with dynamic alias generation
- Generate projects.json config file for shell script consumption
- Update README.md with project shortcuts documentation

Projects supported:
- blog: Personal blog (content workflow)
- mdshortcut: Research project (research workflow)
- nix-config: Nix configuration (basic workflow)

Usage: proj, blog, mdshortcut, nix-config commands

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

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

scripts/templates/content.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Content workflow template - code + separate content directory
+# Usage: content.sh SESSION_NAME CODE_PATH CONTENT_PATH
+
+SESSION_NAME="$1"
+CODE_PATH="$2"
+CONTENT_PATH="$3"
+
+if [ -z "$SESSION_NAME" ] || [ -z "$CODE_PATH" ] || [ -z "$CONTENT_PATH" ]; then
+    echo "Usage: $0 SESSION_NAME CODE_PATH CONTENT_PATH"
+    exit 1
+fi
+
+if tmux has-session -t $SESSION_NAME 2>/dev/null; then
+    tmux attach-session -t $SESSION_NAME
+    exit 0
+fi
+
+# Create windows for code
+tmux new-session -d -s $SESSION_NAME -c "$CODE_PATH"
+tmux rename-window -t $SESSION_NAME:1 "code"
+tmux send-keys -t $SESSION_NAME:1 "nvim" C-m
+tmux new-window -t $SESSION_NAME:2 -n "code-ai" -c "$CODE_PATH"
+tmux send-keys -t $SESSION_NAME:2 "claude -r" C-m
+tmux split-window -t $SESSION_NAME:2 -h -c "$CODE_PATH"
+tmux split-window -t $SESSION_NAME:2.2 -v -c "$CODE_PATH"
+tmux select-pane -t $SESSION_NAME:2.1
+tmux new-window -t $SESSION_NAME:3 -n "git" -c "$CODE_PATH"
+tmux send-keys -t $SESSION_NAME:3 "gitui" C-m
+
+# Create windows for content
+tmux new-window -t $SESSION_NAME:4 -n "content-ai" -c "$CONTENT_PATH"
+tmux send-keys -t $SESSION_NAME:4 "claude -r" C-m
+tmux split-window -t $SESSION_NAME:4 -h -c "$CONTENT_PATH"
+tmux split-window -t $SESSION_NAME:4.2 -v -c "$CONTENT_PATH"
+tmux select-pane -t $SESSION_NAME:4.1
+
+tmux select-window -t $SESSION_NAME:1
+
+tmux attach-session -t $SESSION_NAME