docs: add AI series production and ComfyUI handbook

.gitattributes

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+# Keep text line endings consistent. Save source text as UTF-8 in the editor.
+# No working-tree-encoding or content-conversion filter is configured.
+* text=auto eol=lf
+
+*.md text eol=lf
+*.json text eol=lf
+.gitignore text eol=lf
+.gitattributes text eol=lf
+
+# Documentation images, if added later, remain binary.
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.webp binary
+*.pdf binary