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>

.gitea/workflows/build.yml

@@ -15,6 +15,7 @@ env:
   WEB_IMAGE: apps/myai-web
   CV_CLEANUP_JOB_IMAGE: apps/myai-cv-cleanup-job
   CV_SEARCH_JOB_IMAGE: apps/myai-cv-search-job
+  PAGE_FETCHER_API_IMAGE: apps/myai-page-fetcher-api
   IMAGE_TAG: staging
 
 jobs:
@@ -62,6 +63,10 @@ jobs:
         run: |
           docker build -f Jobs/cv-search-job/Dockerfile -t "${REGISTRY_HOST}/${CV_SEARCH_JOB_IMAGE}:${IMAGE_TAG}" .
 
+      - name: Build Page Fetcher API image
+        run: |
+          docker build -f Apis/page-fetcher-api/Dockerfile -t "${REGISTRY_HOST}/${PAGE_FETCHER_API_IMAGE}:${IMAGE_TAG}" .
+
       - name: Push API image
         run: |
           docker push "${REGISTRY_HOST}/${API_IMAGE}:${IMAGE_TAG}"
@@ -88,4 +93,8 @@ jobs:
 
       - name: Push CV search job image
         run: |
-          docker push "${REGISTRY_HOST}/${CV_SEARCH_JOB_IMAGE}:${IMAGE_TAG}"
+          docker push "${REGISTRY_HOST}/${CV_SEARCH_JOB_IMAGE}:${IMAGE_TAG}"
+
+      - name: Push Page Fetcher API image
+        run: |
+          docker push "${REGISTRY_HOST}/${PAGE_FETCHER_API_IMAGE}:${IMAGE_TAG}"