featmigrate from Angular to Astro static site

BREAKING CHANGE: Complete rewrite from Angular SPA to Astro

- Replace Angular 18 with Astro 5.16.7 + Tailwind CSS
- Convert all Angular components to Astro components
- Add content collections for blog with markdown support
- Setup S3 deployment with CloudFront invalidation
- Add RSS feed and sitemap generation
- Configure Prettier and Biome for code formatting
- Switch from npm to pnpm
- Remove Amplify backend (now fully static)
- Improve SEO and performance with static generation

biome.json

@@ -0,0 +1,46 @@
+{
+	"$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
+	"vcs": {
+		"enabled": true,
+		"clientKind": "git",
+		"useIgnoreFile": true
+	},
+	"files": {
+		"ignoreUnknown": true
+	},
+	"formatter": {
+		"enabled": true,
+		"indentStyle": "tab",
+		"lineWidth": 100
+	},
+	"linter": {
+		"enabled": true,
+		"rules": {
+			"recommended": true,
+			"complexity": {
+				"noExtraBooleanCast": "error",
+				"noUselessConstructor": "error",
+				"useFlatMap": "error"
+			},
+			"correctness": {
+				"noUnusedImports": "off",
+				"noUnusedVariables": "off"
+			},
+			"style": {
+				"noNonNullAssertion": "warn",
+				"useConst": "error",
+				"useTemplate": "error"
+			},
+			"suspicious": {
+				"noExplicitAny": "error",
+				"noArrayIndexKey": "warn"
+			}
+		}
+	},
+	"javascript": {
+		"formatter": {
+			"quoteStyle": "double",
+			"semicolons": "always"
+		}
+	}
+}