Add EmailApi configuration to api and cv-search-job services

Both api and cv-search-job need to connect to email-api for sending emails.
Add EmailApi section to their appsettings.json with BaseUrl and InternalApiKey
placeholders. Environment variables from docker-compose will populate these at runtime.

Also add EmailApi credentials to docker-compose/.env:
- EmailApi__BaseUrl=http://email-api:8080
- EmailApi__InternalApiKey=<shared key>
- EmailApi__RequireApiKey=true

This ensures both services can authenticate and call the email-api service.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Apis/api/appsettings.json

@@ -110,6 +110,10 @@
     "BaseUrl": "",
     "InternalApiKey": ""
   },
+  "EmailApi": {
+    "BaseUrl": "",
+    "InternalApiKey": ""
+  },
   "RateLimiting": {
     "Global": {
       "PermitLimit": 120,

Jobs/cv-search-job/appsettings.json

@@ -81,6 +81,10 @@
     "BaseUrl": "http://cv-matcher-api:8080",
     "InternalApiKey": ""
   },
+  "EmailApi": {
+    "BaseUrl": "http://email-api:8080",
+    "InternalApiKey": ""
+  },
   "FileStorage": {
     "Path": "Files"
   },