Add comprehensive RSS scraper implementation with security and testing

- Modular architecture with separate modules for scraping, parsing, security, validation, and caching
- Comprehensive security measures including HTML sanitization, rate limiting, and input validation
- Robust error handling with custom exceptions and retry logic
- HTTP caching with ETags and Last-Modified headers for efficiency
- Pre-compiled regex patterns for improved performance
- Comprehensive test suite with 66 tests covering all major functionality
- Docker support for containerized deployment
- Configuration management with environment variable support
- Working parser that successfully extracts 32 articles from Warhammer Community

🤖 Generated with [Claude Code](https://claude.ai/code)

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

output/page.html

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@@ -1716,7 +1708,7 @@ background-color: inherit;
         <div class="row mb-10 xl:mb-15">
          <div class="column relative flex items-center">
           <div class="swiper swiper-initialized swiper-horizontal md-max:!overflow-visible">
-           <div aria-live="polite" class="swiper-wrapper" id="swiper-wrapper-b0b6610f82f4be76c" style="transform: translate3d(0px, 0px, 0px);">
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              <a class="group p-[6px] focus-visible:border outline-none rounded-[5px]" href="/en-gb/setting/warhammer-40000/" title="Warhammer 40,000">
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@@ -3577,7 +3569,7 @@ background-color: inherit;
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         <div class="row mt-15">
          <div class="swiper swiper-initialized swiper-horizontal !overflow-visible">
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              <div class="relative aspect-[262/353] rounded-[8px] overflow-hidden border border-transparent group-hover:border-stormcastYellow">
@@ -5410,7 +5402,7 @@ background-color: inherit;
         <div class="row mb-10 xl:mb-15">
          <div class="column relative flex items-center">
           <div class="swiper swiper-initialized swiper-horizontal md-max:!overflow-visible">
-           <div aria-live="polite" class="swiper-wrapper" id="swiper-wrapper-ddd96962b22d0ed1" style="transform: translate3d(0px, 0px, 0px);">
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              <a class="group p-[6px] focus-visible:border outline-none rounded-[5px]" href="/en-gb/setting/warhammer-40000/" title="Warhammer 40,000">
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