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/Controllers/PageController.cs

@@ -0,0 +1,47 @@
+using Microsoft.AspNetCore.Mvc;
+using PageFetcher.Models;
+using PageFetcherApi.Services;
+using Swashbuckle.AspNetCore.Annotations;
+
+namespace PageFetcherApi.Controllers;
+
+/// <summary>
+/// Handles page-fetch requests: navigates to the URL via Playwright and returns rendered HTML and extracted text.
+/// </summary>
+[ApiController]
+[Route("api/page")]
+public sealed class PageController : ControllerBase
+{
+    private readonly PageFetcherService _service;
+    private readonly ILogger<PageController> _logger;
+
+    public PageController(PageFetcherService service, ILogger<PageController> logger)
+    {
+        _service = service;
+        _logger = logger;
+    }
+
+    /// <summary>
+    /// Fetches a web page via headless Chromium.
+    /// Returns rendered HTML and extracted plain text.
+    /// </summary>
+    [HttpPost("fetch")]
+    [SwaggerOperation(Summary = "Fetch a web page", Description = "Navigates to the given URL using Playwright, returns rendered HTML and stripped plain text.")]
+    [SwaggerResponse(StatusCodes.Status200OK, "Page fetched successfully", typeof(FetchPageResponse))]
+    [SwaggerResponse(StatusCodes.Status400BadRequest, "Invalid or non-HTTP(S) URL")]
+    public async Task<ActionResult<FetchPageResponse>> Fetch([FromBody] FetchPageRequest request, CancellationToken ct)
+    {
+        if (string.IsNullOrWhiteSpace(request.Url))
+            return BadRequest(new { Error = "Url is required." });
+
+        if (!Uri.TryCreate(request.Url, UriKind.Absolute, out var uri) ||
+            (uri.Scheme != Uri.UriSchemeHttp && uri.Scheme != Uri.UriSchemeHttps))
+            return BadRequest(new { Error = "Url must be an absolute HTTP or HTTPS URL." });
+
+        _logger.LogInformation("Fetch request: {Url} | caller={Caller} | waitFor={WaitFor}",
+            request.Url, request.CallerService, request.WaitFor);
+
+        var result = await _service.FetchAsync(request, ct);
+        return Ok(result);
+    }
+}