cleanup: remove binaries and build artifacts from git tracking

Remove large files that should not be committed:
- insertr binary (19MB) - generated Go executable
- test-output/ and client-dist/ - build output directories
- demo-site/insertr.js - generated from lib/dist/insertr.js
- internal/content/assets/*.js - embedded build artifacts
- outdated integration/version control summary files
- log files (server.log)

Update .gitignore to exclude:
- Compiled binaries (insertr, insertr.exe)
- Generated assets (demo-site/insertr.js, internal/content/assets/*.js)
- Build output directories (test-output/, client-dist/)
- Database files (*.db) and log files (*.log)
- Air temporary files

Repository size reduction: ~20MB+ of unnecessary tracked files removed

.gitignore

@@ -68,9 +68,37 @@ insertr-cli/build-errors.log
 *.db
 *.sqlite
 *.sqlite3
+dev.db
+insertr.db
+integration.db
+test-ids.db
+
+# Log files
+server.log
+*.log
 
 # Local development files
 .local/
 
-# Demo site generated files
-demo-site/insertr.js# Node.js root dependencies
+# Compiled binaries
+insertr
+insertr.exe
+/insertr
+/insertr.exe
+
+# Generated/built assets
+demo-site/insertr.js
+demo-site/insertr.min.js
+internal/content/assets/insertr.js
+internal/content/assets/insertr.min.js
+
+# Test and build output directories
+test-output/
+client-dist/
+output/
+
+# Air temporary files
+tmp/
+.air/
+
+# Node.js root dependencies