chore: clean up logs and IDE files, add git hygiene

- Remove runtime logs (access/error logs are not needed in repo)
- Remove .idea/ IDE configuration directory
- Add .gitignore for logs, IDE, OS files
- Add .gitattributes to preserve KOI8-R encoding for archive files
- Preserve all text files as-is without CRLF normalization

.gitattributes

@@ -0,0 +1,25 @@
+# Archive encoding: KOI8-R
+# All text files should preserve original encoding without conversion
+
+# HTML and config files - preserve KOI8-R encoding, keep LF endings
+*.htm -text
+*.html -text
+*.conf -text
+*.txt -text
+*.css -text
+
+# Binary files
+*.gif binary
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.ico binary
+*.svg binary
+*.gz binary
+
+# Git system files
+.git* text eol=lf
+.gitignore text eol=lf
+.gitattributes text eol=lf
+README* text eol=lf
+