feat: add page-fetcher-api — centralised Playwright page fetcher

Introduces page-fetcher-api, a new internal ASP.NET Core service that
centralises all web-page fetching through a single Playwright (headless
Chromium) browser instance. All fetches are persisted to the pageFetcher
SQL schema for auditing.

New projects:
- Apis/page-fetcher-api-models: FetchPageRequest, FetchPageResponse, IPageFetcherApiClient
- Apis/page-fetcher-data: PageFetchDbContext, PageFetchEntity, InitialSchema migration (schema: pageFetcher)
- Apis/page-fetcher-api: PlaywrightBrowserService (singleton), PageFetcherService, PageController

Changes to existing services:
- cv-matcher-api: JobTextExtractor now calls IPageFetcherApiClient instead of HttpClient
- cv-search-job: HtmlJobSearcher uses IPageFetcherApiClient (removes inline Playwright);
  CvSearchJobTask fetches individual job pages and applies keyword pre-filter before
  LLM call; passes pre-fetched JobDescription to cv-matcher-api to skip re-fetch
- common: add PageFetcherApiSettings
- docker-compose.yml, build.yml: add new service + env vars for callers

Closes #43

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Apis/page-fetcher-api/page-fetcher-api.csproj

@@ -0,0 +1,34 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+    <RootNamespace>PageFetcherApi</RootNamespace>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <NoWarn>$(NoWarn);1591</NoWarn>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Playwright" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Serilog.AspNetCore" />
+    <PackageReference Include="Serilog.Enrichers.Environment" />
+    <PackageReference Include="Serilog.Sinks.Console" />
+    <PackageReference Include="Serilog.Sinks.File" />
+    <PackageReference Include="Serilog.Sinks.Email" />
+    <PackageReference Include="Swashbuckle.AspNetCore" />
+    <PackageReference Include="Swashbuckle.AspNetCore.Annotations" />
+    <PackageReference Include="DotNetEnv" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\page-fetcher-data\page-fetcher-data.csproj" />
+    <ProjectReference Include="..\page-fetcher-api-models\page-fetcher-api-models.csproj" />
+    <ProjectReference Include="..\common\common.csproj" />
+    <ProjectReference Include="..\..\Helpers\startup-helpers\startup-helpers.csproj" />
+    <ProjectReference Include="..\..\Helpers\common-helpers\common-helpers.csproj" />
+  </ItemGroup>
+</Project>