remove: broken Playwright E2E testing infrastructure

- Remove playwright.config.ts (references non-existent docker/docker-compose.yaml)
- Remove tests/e2e/ directory with broken test files
- Remove @playwright/test dependency from package.json
- Update documentation to remove E2E test references:
  - docs/architecture/PROJECT_STRUCTURE.md
  - docs/implementation/IMPLEMENTATION_SUMMARY.md
  - README.md
  - CONTRIBUTING.md
- E2E tests were non-functional due to missing Docker setup
- Focus on working unit and integration tests instead

bun.lock

@@ -14,7 +14,6 @@
         "@babel/core": "^7.28.4",
         "@babel/preset-env": "^7.28.3",
         "@babel/preset-typescript": "^7.27.1",
-        "@playwright/test": "^1.55.0",
         "@secretlint/node": "^11.2.3",
         "@secretlint/secretlint-rule-preset-recommend": "^11.2.3",
         "@testing-library/jest-dom": "^6.8.0",
@@ -432,8 +431,6 @@
 
     "@pkgr/core": ["@pkgr/core@0.2.9", "", {}, "sha512-QNqXyfVS2wm9hweSYD2O7F0G06uurj9kZ96TRQE5Y9hU7+tgdZwIkbAKc5Ocy1HxEY2kuDQa6cQ1WRs/O5LFKA=="],
 
-    "@playwright/test": ["@playwright/test@1.55.0", "", { "dependencies": { "playwright": "1.55.0" }, "bin": { "playwright": "cli.js" } }, "sha512-04IXzPwHrW69XusN/SIdDdKZBzMfOT9UNT/YiJit/xpy2VuAoB8NHc8Aplb96zsWDddLnbkPL3TsmrS04ZU2xQ=="],
-
     "@rollup/rollup-android-arm-eabi": ["@rollup/rollup-android-arm-eabi@4.50.0", "", { "os": "android", "cpu": "arm" }, "sha512-lVgpeQyy4fWN5QYebtW4buT/4kn4p4IJ+kDNB4uYNT5b8c8DLJDg6titg20NIg7E8RWwdWZORW6vUFfrLyG3KQ=="],
 
     "@rollup/rollup-android-arm64": ["@rollup/rollup-android-arm64@4.50.0", "", { "os": "android", "cpu": "arm64" }, "sha512-2O73dR4Dc9bp+wSYhviP6sDziurB5/HCym7xILKifWdE9UsOe2FtNcM+I4xZjKrfLJnq5UR8k9riB87gauiQtw=="],
@@ -1570,10 +1567,6 @@
 
     "pkg-dir": ["pkg-dir@4.2.0", "", { "dependencies": { "find-up": "^4.0.0" } }, "sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ=="],
 
-    "playwright": ["playwright@1.55.0", "", { "dependencies": { "playwright-core": "1.55.0" }, "optionalDependencies": { "fsevents": "2.3.2" }, "bin": { "playwright": "cli.js" } }, "sha512-sdCWStblvV1YU909Xqx0DhOjPZE4/5lJsIS84IfN9dAZfcl/CIZ5O8l3o0j7hPMjDvqoTF8ZUcc+i/GL5erstA=="],
-
-    "playwright-core": ["playwright-core@1.55.0", "", { "bin": { "playwright-core": "cli.js" } }, "sha512-GvZs4vU3U5ro2nZpeiwyb0zuFaqb9sUiAJuyrWpcGouD8y9/HLgGbNRjIph7zU9D3hnPaisMl9zG9CgFi/biIg=="],
-
     "plugin-error": ["plugin-error@1.0.1", "", { "dependencies": { "ansi-colors": "^1.0.1", "arr-diff": "^4.0.0", "arr-union": "^3.1.0", "extend-shallow": "^3.0.2" } }, "sha512-L1zP0dk7vGweZME2i+EeakvUNqSrdiI3F91TwEoYiGrAfUXmVv6fJIq4g82PAXxNsWOp0J7ZqQy/3Szz0ajTxA=="],
 
     "pluralize": ["pluralize@8.0.0", "", {}, "sha512-Nc3IT5yHzflTfbjgqWcCPpo7DaKy4FnpB0l/zCAW0Tc7jxAiuqSxHasntB3D7887LSrA93kDJ9IXovxJYxyLCA=="],
@@ -2134,8 +2127,6 @@
 
     "pkg-dir/find-up": ["find-up@4.1.0", "", { "dependencies": { "locate-path": "^5.0.0", "path-exists": "^4.0.0" } }, "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw=="],
 
-    "playwright/fsevents": ["fsevents@2.3.2", "", { "os": "darwin" }, "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA=="],
-
     "raw-body/iconv-lite": ["iconv-lite@0.7.0", "", { "dependencies": { "safer-buffer": ">= 2.1.2 < 3.0.0" } }, "sha512-cf6L2Ds3h57VVmkZe+Pn+5APsT7FpqJtEhhieDCvrE2MK5Qk9MyffgQyuxQTm6BChfeZNtcOLHp9IcWRVcIcBQ=="],
 
     "rc-config-loader/js-yaml": ["js-yaml@4.1.0", "", { "dependencies": { "argparse": "^2.0.1" }, "bin": { "js-yaml": "bin/js-yaml.js" } }, "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA=="],