Add Docker support with Dockerfile, docker-compose, and entrypoint script; update .gitignore and add .dockerignore

.dockerignore

@@ -0,0 +1,51 @@
+# ── Git ──────────────────────────────────────
+.git
+.gitignore
+.gitattributes
+
+# ── Env files (use .env.docker instead) ─────
+.env
+.env.local
+.env.*.local
+
+# ── Node / build artifacts ───────────────────
+node_modules
+npm-debug.log*
+
+# ── Laravel local storage (mounted as volume)
+storage/logs/*
+storage/framework/cache/*
+storage/framework/sessions/*
+storage/framework/views/*
+storage/app/private/*
+
+# ── Laravel bootstrap cache ──────────────────
+bootstrap/cache/*.php
+
+# ── SQLite database (mounted as volume) ──────
+database/database.sqlite
+
+# ── Compiled assets (rebuilt in Dockerfile) ──
+public/build
+public/hot
+
+# ── Tests / dev tooling ──────────────────────
+tests
+phpunit.xml
+.editorconfig
+.php-cs-fixer*
+
+# ── IDE / OS ─────────────────────────────────
+.idea
+.vscode
+*.DS_Store
+Thumbs.db
+
+# ── Docker config itself ─────────────────────
+Dockerfile
+docker-compose*.yml
+docker/
+
+# ── Claude / project meta ────────────────────
+.claude
+README.md