Merge main into f/updates

Resolved conflicts by keeping f/updates changes:
- Keep Angular frontend with dark theme styling
- Keep updated quickstart scripts at root level
- Remove static HTML/JS files (replaced by Angular)
- Keep sim_source_id field implementation
- Merge backend improvements from main

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

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

Dockerfile

@@ -1,12 +1,15 @@
-FROM python:3.11-slim
+FROM python:3.11-alpine
 
 WORKDIR /app
 
-# Install system dependencies
-RUN apt-get update && apt-get install -y \
+# Install system dependencies for Alpine
+# Alpine uses apk instead of apt-get and is lighter/faster
+RUN apk add --no-cache \
     gcc \
+    musl-dev \
+    postgresql-dev \
     postgresql-client \
-    && rm -rf /var/lib/apt/lists/*
+    linux-headers
 
 # Copy requirements and install Python dependencies
 COPY requirements.txt .
@@ -18,8 +21,8 @@ COPY utils/ ./utils/
 COPY alembic/ ./alembic/
 COPY alembic.ini .
 
-# Create non-root user
-RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
+# Create non-root user (Alpine uses adduser instead of useradd)
+RUN adduser -D -u 1000 appuser && chown -R appuser:appuser /app
 USER appuser
 
 # Expose port