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/appsettings.json

@@ -0,0 +1,73 @@
+{
+  "Serilog": {
+    "Using": [
+      "Serilog.Sinks.Console",
+      "Serilog.Sinks.File"
+    ],
+    "MinimumLevel": {
+      "Default": "Information",
+      "Override": {
+        "Microsoft.AspNetCore": "Warning",
+        "Microsoft.AspNetCore.Hosting": "Information",
+        "Microsoft.AspNetCore.Routing": "Warning",
+        "System.Net.Http.HttpClient": "Warning",
+        "PageFetcherApi": "Information"
+      }
+    },
+    "WriteTo": [
+      {
+        "Name": "Console",
+        "Args": {
+          "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}] {SourceContext}: {Message:lj}{NewLine}{Exception}"
+        }
+      },
+      {
+        "Name": "File",
+        "Args": {
+          "path": "logs/page-fetcher-api-.log",
+          "rollingInterval": "Day",
+          "retainedFileCountLimit": 30,
+          "outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {SourceContext}: {Message:lj}{NewLine}{Exception}"
+        }
+      }
+    ],
+    "Enrich": [
+      "FromLogContext",
+      "WithMachineName",
+      "WithEnvironmentName"
+    ]
+  },
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.AspNetCore.Hosting": "Information",
+      "Microsoft.AspNetCore.Routing": "Warning",
+      "System.Net.Http.HttpClient": "Warning",
+      "PageFetcherApi": "Information"
+    }
+  },
+  "LogEnvironmentOnStartup": true,
+  "AllowedHosts": "*",
+  "KeyVault": {
+    "VaultUri": "",
+    "Enabled": false
+  },
+  "Database": {
+    "Host": "localhost",
+    "Port": 1433,
+    "Name": "MyAiDb",
+    "User": "sa",
+    "Password": "",
+    "TrustServerCertificate": true
+  },
+  "InternalApi": {
+    "ApiKey": "",
+    "RequireApiKey": true
+  },
+  "PageFetcher": {
+    "DefaultWaitFor": "networkidle",
+    "TimeoutSeconds": 30,
+    "MaxTextChars": 60000
+  }
+}