chore: Add .gitignore and remove build artifacts from repository

- Add comprehensive .gitignore for .NET MAUI projects
- Remove 2,651 tracked build artifacts (bin/, obj/ directories)
- Build artifacts should be generated in CI/CD, not committed

Patterns added to .gitignore:
- Build outputs (bin/, obj/, Debug/, Release/)
- IDE files (.vs/, .vscode/, *.user, .idea/)
- Test results and coverage files
- NuGet packages (*.nupkg, *.snupkg)
- SQLite database files (*.db, *.db-shm, *.db-wal)
- Platform-specific build artifacts
- Temporary and cache files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,117 @@
+## .NET Build Artifacts
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Visual Studio cache/options
+.vs/
+.vscode/
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# ReSharper
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# Test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+*.trx
+*.coverage
+*.coveragexml
+
+# NuGet Packages
+*.nupkg
+*.snupkg
+**/packages/*
+!**/packages/build/
+
+# MAUI Specific
+**/[Bb]in/
+**/[Oo]bj/
+**/.vs/
+**/.vscode/
+
+# macOS
+.DS_Store
+*.DS_Store
+
+# Windows
+Thumbs.db
+ehthumbs.db
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# Publish profiles
+*.pubxml
+*.publishproj
+
+# Build artifacts
+*.dll
+*.exe
+*.pdb
+*.cache
+*.ilk
+*.log
+*.tlog
+*.lastbuildstate
+*.idb
+*.ipch
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Azure artifacts
+*.azurePubxml
+
+# SQLite database files (runtime data)
+*.db
+*.db-shm
+*.db-wal
+
+# Android/iOS specific build artifacts
+**/Resource.designer.cs
+**/[Aa]ndroid/**/[Rr]esource.designer.cs
+**/[Ii]OS/**/[Rr]esource.designer.cs