chore: add appsettings.json files to .gitignore and remove from repository

- Add appsettings.json and appsettings.*.json to .gitignore
- Remove all appsettings.json files from git tracking
- Prevents accidental commit of API keys and configuration secrets

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

.gitignore

@@ -1,9 +1,10 @@
-# Create .gitignore (if not already present)
-echo "# Dependencies
+# Dependencies
 node_modules/
 dist/
 build/
 *.log
+
+# Environment files
 .env
 .env.local
 .env.*.local
@@ -25,6 +26,9 @@ obj/
 *.suo
 *.cache
 
+# Configuration files (contain secrets)
+appsettings.json
+appsettings.*.json
+
 # Frontend
 .coverage
-" > .gitignore

GermanApp/appsettings.Development.json

@@ -1,11 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Debug",
-      "Microsoft.AspNetCore": "Information"
-    }
-  },
-  "ConnectionStrings": {
-    "DefaultConnection": "Host=localhost;Port=5432;Database=DeutschLernen;Username=postgres;Password=postgres"
-  }
-}

GermanApp/appsettings.Production.json

@@ -1,11 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Warning",
-      "Microsoft.AspNetCore": "Error"
-    }
-  },
-  "ConnectionStrings": {
-    "DefaultConnection": "Host=prod-db;Port=5432;Database=DeutschLernen;Username=postgres;Password=${DB_PASSWORD}"
-  }
-}

GermanApp/appsettings.Staging.json

@@ -1,11 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  },
-  "ConnectionStrings": {
-    "DefaultConnection": "Host=staging-db;Port=5432;Database=DeutschLernen;Username=postgres;Password=${DB_PASSWORD}"
-  }
-}

GermanApp/appsettings.json

@@ -1,18 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  },
-  "AllowedHosts": "*",
-  "ConnectionStrings": {
-    "DefaultConnection": "Host=localhost;Port=5432;Database=DeutschLernen;Username=postgres;Password=postgres"
-  },
-  "Jwt": {
-    "Key": "your-super-secret-key-at-least-32-characters-long",
-    "Issuer": "DeutschLernen",
-    "Audience": "DeutschLernen",
-    "ExpireHours": 24
-  }
-}