Fix .gitignore - restore project and solution files

.gitignore

@@ -1,62 +1,79 @@
-# .NET
+# .NET Build outputs
 bin/
 obj/
-*.user
-*.suo
-*.userosscache
 *.dll
 *.exe
 *.pdb
-*.cache
-*.config
-*.csproj
-*.vbproj
-*.vshost.*
-*.bak
-TestResult.xml
-[Bb]in
-[Oo]bj
-[Tt]est[Rr]esults
-*.sln.cache
-*.suo
-*.cache
+
+# User-specific files
 *.user
+*.suo
 *.userosscache
-*.dll
-*.pdb
-*.bak
-*.dotCover
+*.sln.docstates
+*.userprefs
+
+# Visual Studio
+.vs/
+*.sln.ide/
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+build/
+bld/
+[Bb]in/
+[Oo]bj/
+
+# Test results
+[Tt]est[Rr]esult*/
+TestResults/
+*.trx
+*.coverage
+*.coveragexml
+
+# NuGet
+packages/
+*.nupkg
+*.snupkg
+**/[Pp]ackages/*
+!**/[Pp]ackages/build/
 
 # Angular
 node_modules/
 dist/
 *.log
+npm-debug.log*
 
-# System Files
+# System Files  
 .DS_Store
 Thumbs.db
 
-# Visual Studio Code
+# IDE
 .vscode/
+.idea/
 
-# Visual Studio 
-*.sln
-*.suo
-*.user
-*.userosscache
-*.sln.docstates
-*.sln.ide/
-*.dbmdl
-*.jfm
-*.pfx
-*.publishsettings
-orleans.codegen.cs
-
-# ReSharper is a .NET coding add-in
+# ReSharper
 _ReSharper*/
 *.[Rr]e[Ss]harper
 *.DotSettings.user
 
-.vs/
+# Temporary files
 Temp/
-WebAPI/diunabi-admin-firebase-Development.json
+*.tmp
+*.temp
+*.cache
+*.bak
+
+# Sensitive files
+**/appsettings.Development.json
+**/firebase-adminsdk-*.json
+src/Backend/DiunaBI.WebAPI/diunabi-admin-firebase-Development.json
+
+# WAŻNE: NIE IGNORUJ tych plików!
+# *.csproj  ← USUNIĘTE!
+# *.sln     ← USUNIĘTE!
+# *.config  ← USUNIĘTE!