Fix Dockerfile build order for phoenix-colocated

The phoenix-colocated JS files are generated during Elixir compilation.
Reordered steps to:
1. Compile Elixir code (generates phoenix-colocated files)
2. Copy assets
3. Deploy assets (esbuild can now find phoenix-colocated imports)

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

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

Dockerfile

@@ -23,14 +23,16 @@ RUN mix deps.compile
 COPY config config
 COPY priv priv
 COPY lib lib
+
+# Compile the project (generates phoenix-colocated files)
+RUN mix compile
+
+# Copy assets after compilation
 COPY assets assets
 
-# Compile assets
+# Compile and deploy assets
 RUN mix assets.deploy
 
-# Compile the project
-RUN mix compile
-
 # Build release
 RUN mix release