Add Gitea Actions workflows, CI config, and docs

.gitattributes

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+# =============================================================================
+# .gitattributes — Normalize line endings and mark binary files
+# =============================================================================
+
+# Default: auto-detect text files, normalize to LF on commit.
+* text=auto eol=lf
+
+# Explicitly declare text files
+*.py    text diff=python
+*.js    text
+*.ts    text
+*.json  text
+*.yml   text
+*.yaml  text
+*.md    text
+*.txt   text
+*.cfg   text
+*.ini   text
+*.env   text
+*.sh    text eol=lf
+*.bash  text eol=lf
+
+Makefile text eol=lf
+Dockerfile text eol=lf
+
+# Explicitly declare binary files
+*.png   binary
+*.jpg   binary
+*.jpeg  binary
+*.gif   binary
+*.ico   binary
+*.gz    binary
+*.zip   binary
+*.tar   binary
+*.woff  binary
+*.woff2 binary
+*.ttf   binary
+*.eot   binary