feat: integrate Pi backend and Pi Web

pi/.gitattributes

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+# Default to LF for text files across the repo
+* text=auto eol=lf
+
+# Windows scripts should keep CRLF
+*.bat text eol=crlf
+*.cmd text eol=crlf
+*.ps1 text eol=crlf
+
+# Shell scripts should keep LF
+*.sh text eol=lf
+
+# Common binary assets
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.webp binary
+*.ico binary
+*.pdf binary
+*.zip binary
+*.gz binary
+*.woff binary
+*.woff2 binary