docs: Add v1.7.8 release notes and update gitignore

• Added comprehensive release notes for v1.7.8
• Updated .gitignore to exclude runtime test data files
• Documented all features, fixes, and improvements

Author: htafolla

.gitignore

@@ -372,4 +372,8 @@ build/Release/
 .nuxt/
 dist/
 build/
-out/
+out/
+# Runtime data and test artifacts
+performance-baselines.json
+Users/blaze/dev/stringray/test-consent.json
+