Move to infisical. Create local dev environment. Add ci gates. Modernize repo

.gitignore

@@ -10,6 +10,10 @@ node_modules
 
 # testing
 coverage
+**/.cache/
+
+# generated Convex client/server bindings (tracked, but not linted/formatted)
+packages/backend/convex/_generated/
 
 # next.js
 .next/
@@ -48,9 +52,17 @@ yarn-error.log*
 .env.test.local
 .env.production.local
 .env
+.env.staging
+.local/
 
 # turbo
-.turbo
+.turbo/
+**/.turbo/
+
+# playwright e2e
+apps/next/tests/e2e/.auth/
+apps/next/test-results/
+apps/next/playwright-report/
 
 # tanstack
 .tanstack