Initial upload: DevDash CLI with TUI dashboard

.env.example

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+# DevDash CLI Configuration
+# Copy this file to .env and fill in your values
+
+# GitHub Personal Access Token (required for GitHub features)
+GITHUB_TOKEN=
+
+# GitLab Personal Access Token (required for GitLab features)
+GITLAB_TOKEN=
+
+# Default repository in 'owner/repo' format
+DEVDASH_REPO=
+
+# Default refresh interval in seconds (default: 30)
+DEVDASH_REFRESH=30
+
+# Color theme: dark or light (default: dark)
+DEVDASH_THEME=dark