chore: improve .gitignore with better organization

- Organized entries into logical sections (IDEs, macOS, MCP, etc.)
- Fixed .DS_Store pattern to work in all subdirectories (**/.DS_Store)
- Added macOS-specific ignores (.AppleDouble, .LSOverride)
- Added database SQLite ignores (*.sqlite, *.sqlite-journal)
- Added backup/temporary file patterns (*.bak, *.tmp, *.swp)
- Added log file ignore (*.log)
- Added docs temporary exports (*.pptx, *.docx in diagrams/)
- Removed obsolete AGENTS*.* pattern (file already deleted)
- Removed standalone 'env' pattern (covered by .env.backup)

.gitignore

@@ -15,16 +15,43 @@ Homestead.yaml
 npm-debug.log
 yarn-error.log
 /auth.json
+
+# IDEs
 /.fleet
 /.idea
 /.nova
 /.zed
-.DS_Store
-env
+/.junie/*
+/.cursor/*
+/.vscode/*
+
+# macOS
+**/.DS_Store
+.AppleDouble
+.LSOverride
+
+# MCP
 *.mcp*
 *.mdc
 /.mcp.json
-AGENTS*.*
-/.junie/*
-/.cursor/*
-/.vscode/*
+
+# Database
+/database/*.sqlite
+/database/*.sqlite-journal
+*.sql.gz
+
+# Backup & Temporary Files
+*.bak
+*.backup
+*.tmp
+*.swp
+*~
+.*.swp
+.*.swo
+
+# Logs
+*.log
+
+# Documentation temporary files (generated exports)
+/docs/diagrams/*.pptx
+/docs/diagrams/*.docx