Refactor and update various components of EchoHub.Server

- Updated launchSettings.json for consistency.
- Refactored FileValidationHelper to improve image validation logic.
- Enhanced ServerDirectoryService for better connection handling and user count updates.
- Improved DatabaseSetup for legacy database handling and seeding default channels.
- Refined FirstRunSetup to ensure JWT secret generation.
- Removed appsettings.Development.json as it is no longer needed.
- Updated EchoHub.Tests project file for consistency.
- Added unit tests for FileValidationHelper and PresenceTracker with improved assertions.
- Updated ValidationConstantsTests to ensure regex validations are correct.
- Cleaned up solution file formatting for better readability.

.github/workflows/pr-check.yml

@@ -1,65 +1,65 @@
-name: PR Check
-
-on:
-  pull_request:
-    branches: [master]
-
-jobs:
-  lint-markdown:
-    name: Markdown Lint
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Run markdownlint
-        run: bash scripts/lint-markdown.sh
-
-  test:
-    name: Build & Test
-    needs: lint-markdown
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Check for src/ changes
-        id: changes
-        env:
-          BASE_REF: ${{ github.base_ref }}
-        run: |
-          git fetch origin "$BASE_REF" --depth=1
-          CHANGED=$(git diff --name-only "origin/$BASE_REF"...HEAD -- 'src/' | wc -l)
-          if [ "$CHANGED" -gt 0 ]; then
-            echo "src_changed=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "src_changed=false" >> "$GITHUB_OUTPUT"
-          fi
-
-      - name: Setup .NET 10
-        if: steps.changes.outputs.src_changed == 'true'
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: '10.0.x'
-
-      - name: Cache NuGet packages
-        if: steps.changes.outputs.src_changed == 'true'
-        uses: actions/cache@v4
-        with:
-          path: ~/.nuget/packages
-          key: nuget-${{ runner.os }}-${{ hashFiles('src/**/*.csproj') }}
-          restore-keys: nuget-${{ runner.os }}-
-
-      - name: Restore dependencies
-        if: steps.changes.outputs.src_changed == 'true'
-        run: dotnet restore src/EchoHub.slnx
-
-      - name: Build
-        if: steps.changes.outputs.src_changed == 'true'
-        run: dotnet build src/EchoHub.slnx --no-restore --configuration Release
-
-      - name: Test
-        if: steps.changes.outputs.src_changed == 'true'
-        run: dotnet test src/EchoHub.slnx --no-build --configuration Release --verbosity normal
-
-      - name: Skip notice
-        if: steps.changes.outputs.src_changed == 'false'
-        run: echo "No changes in src/ — skipping build and test"
+name: PR Check
+
+on:
+  pull_request:
+    branches: [master]
+
+jobs:
+  lint-markdown:
+    name: Markdown Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run markdownlint
+        run: bash scripts/lint-markdown.sh
+
+  test:
+    name: Build & Test
+    needs: lint-markdown
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check for src/ changes
+        id: changes
+        env:
+          BASE_REF: ${{ github.base_ref }}
+        run: |
+          git fetch origin "$BASE_REF" --depth=1
+          CHANGED=$(git diff --name-only "origin/$BASE_REF"...HEAD -- 'src/' | wc -l)
+          if [ "$CHANGED" -gt 0 ]; then
+            echo "src_changed=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "src_changed=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Setup .NET 10
+        if: steps.changes.outputs.src_changed == 'true'
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Cache NuGet packages
+        if: steps.changes.outputs.src_changed == 'true'
+        uses: actions/cache@v4
+        with:
+          path: ~/.nuget/packages
+          key: nuget-${{ runner.os }}-${{ hashFiles('src/**/*.csproj') }}
+          restore-keys: nuget-${{ runner.os }}-
+
+      - name: Restore dependencies
+        if: steps.changes.outputs.src_changed == 'true'
+        run: dotnet restore src/EchoHub.slnx
+
+      - name: Build
+        if: steps.changes.outputs.src_changed == 'true'
+        run: dotnet build src/EchoHub.slnx --no-restore --configuration Release
+
+      - name: Test
+        if: steps.changes.outputs.src_changed == 'true'
+        run: dotnet test src/EchoHub.slnx --no-build --configuration Release --verbosity normal
+
+      - name: Skip notice
+        if: steps.changes.outputs.src_changed == 'false'
+        run: echo "No changes in src/ — skipping build and test"