normalize project structure: src/client + src/server + src/shared, standardize biome to lineWidth 80

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -3,7 +3,6 @@ node_modules
 .claude
 
 # Override global gitignore exclusions
-!/server/
 !/src/
 !**/lib/
 
@@ -14,9 +13,7 @@ node_modules
 !.env.example
 
 # IGDB cache (generated at runtime)
-server/data/igdb-cache.json
-server/data/igdb-metadata.json
-server/data/igdb-images/
+src/server/data/
 
 # Build outputs
 dist
@@ -24,9 +21,13 @@ build
 .vite
 coverage
 
+# Database
+drizzle/
+
 # Logs
 *.log
 npm-debug.log*
 
 # bun
 bun.lock
+.mise.local.toml