feat: initial Unity project setup with .gitignore

.gitignore

@@ -0,0 +1,75 @@
+# ---------------------------
+# Unity .gitignore
+# ---------------------------
+
+# --- Build / Output ---
+[Bb]uild/
+[Bb]uilds/
+[Oo]utput/
+[Oo]bj/
+[Ll]ogs/
+UserSettings/
+
+# --- IDE / Editor ---
+.idea/
+.vs/
+.vscode/
+*.sln
+*.csproj
+*.user
+*.userosscache
+*.suo
+*.userprefs
+*.pidb
+*.booproj
+*.svd
+*.pdb
+*.mdb
+*.opendb
+*.VC.db
+
+# --- OS ---
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+*.swp
+*~.nib
+
+# --- Unity generated ---
+[Tt]emp/
+[Ll]ibrary/
+[Oo]bj/
+ExportedObj/
+
+# --- Asset metadata (keep .meta files, they are critical) ---
+# *.meta   <- DO NOT ignore .meta files! Unity needs them.
+
+# --- Console logs ---
+*.log
+*.log.meta
+
+# --- Crash reports ---
+Crashlytics/
+*.crash
+*.crash.meta
+
+# --- Asset Store Tools ---
+AssetStoreTools/
+AssetStoreTools.meta
+
+# --- Autosave ---
+Autosave/
+Autosave.meta
+
+# --- Packages (keep manifest, ignore cache) ---
+/[Pp]ackages/*
+!/[Pp]ackages/manifest.json
+!/[Pp]ackages/packages-lock.json
+
+# --- Rider ---
+.idea/
+*.sln.DotSettings.user