feat: add remote jobs filter for JobSpy (#70)

* feat(types): add jobspyIsRemote to TypeScript type definitions

- Add jobspyIsRemote boolean fields to AppSettings interface
- Follow three-field pattern: value, default, override
- Update test fixture with default values (false)

* feat(validation): add jobspyIsRemote validation schema

Add Zod validation schema for jobspyIsRemote boolean setting to ensure type safety in the settings API endpoint.

* feat(db): add jobspyIsRemote to database repository setting keys

* feat(api): add jobspyIsRemote storage to settings API route

* feat(service): add jobspyIsRemote to settings service with environment variable support

* feat(jobspy): add isRemote parameter to JobSpy service interface

* feat(pipeline): pass isRemote setting to JobSpy service

* feat(python): add is_remote parameter to JobSpy scraper script

* feat(ui): add Remote Jobs checkbox to JobSpy settings

* feat(ui): add Remote badge to job display

- Display Remote badge when job.isRemote === true
- Position badge next to Source badge in JobHeader
- Use Badge component with outline variant
- Badge does not display when isRemote is false or null

* docs(env): add JOBSPY_IS_REMOTE environment variable documentation

- Added JobSpy section to .env.example with JOBSPY_IS_REMOTE variable
- Documents remote-only job filtering option with default value of 0 (disabled)
- Follows existing .env.example format with clear section headers and descriptions

* test(remote-jobs): verify end-to-end functionality with comprehensive feedback loops

.env.example

@@ -27,3 +27,9 @@ BASIC_AUTH_PASSWORD=
 UKVISAJOBS_EMAIL=
 UKVISAJOBS_PASSWORD=
 UKVISAJOBS_HEADLESS=true
+
+# =============================================================================
+# JobSpy - Job search configuration
+# =============================================================================
+# Filter for remote-only jobs (default: 0 = disabled)
+# JOBSPY_IS_REMOTE=0