feat(build): embed static assets into Go binary

Embed frontend build output directly into Go binary using //go:embed.
This removes runtime dependency on ../frontend/public/ path and
simplifies Docker builds by serving assets from embedded filesystem.

- Add backend/web/embed.go with embed.FS directive
- Update server to serve from embedded static assets
- Update Makefile to copy frontend build to web/static/
- Update Dockerfile for simplified multi-stage build
- Update frontend package.json output paths
- Remove custom 'oc' command from flake.nix dev shell

Dockerfile

@@ -1,70 +1,30 @@
-# Multi-stage build for Aethera
-# Stage 1: Build frontend assets
+# Step 1: Build Frontend
 FROM oven/bun:1 AS frontend-builder
-
 WORKDIR /app/frontend
-
-# Copy frontend package files
 COPY frontend/package.json frontend/bun.lock ./
-
-# Install dependencies
 RUN bun install --frozen-lockfile
-
-# Copy frontend source code
 COPY frontend/ ./
-
-# Build frontend assets
 RUN bun run build
 
-# Stage 2: Build Go binary
+# Stage 2: Build Backend
 FROM golang:1.25-alpine AS backend-builder
-
 WORKDIR /app
-
-# Install build dependencies
 RUN apk add --no-cache git
-
-# Copy go mod files
 COPY backend/go.mod backend/go.sum ./
-
-# Download Go dependencies
 RUN go mod download
-
-# Copy backend source code
 COPY backend/ ./
+COPY --from=frontend-builder /app/frontend/public/ ./web/static/
+RUN go build -ldflags="-w -s" -o aethera ./cmd
 
-# Copy frontend assets from previous stage
-COPY --from=frontend-builder /app/frontend/public/dist ./public/dist
-COPY --from=frontend-builder /app/frontend/public/index.html ./public/
-COPY --from=frontend-builder /app/frontend/public/pages ./public/pages
-
-# Build the Go binary
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o aethera ./cmd
-
-# Stage 3: Create minimal runtime image
+# Stage 3: Minimal Runtime
 FROM alpine:3.21
-
-# Install ca-certificates for HTTPS calls
 RUN apk add --no-cache ca-certificates
-
 WORKDIR /app
-
-# Copy the binary from the builder stage
 COPY --from=backend-builder /app/aethera .
-
-# Copy static assets
-COPY --from=backend-builder /app/public ./public
-
-# Create data directory
 RUN mkdir -p /app/data
 
-# Expose the default port
 EXPOSE 8080
-
-# Set environment variable defaults
 ENV AETHERA_LISTEN=0.0.0.0
 ENV AETHERA_PORT=8080
 ENV AETHERA_DATA_DIR=/app/data
-
-# Set the entrypoint
 ENTRYPOINT ["./aethera"]

Makefile

@@ -4,6 +4,9 @@ all: frontend backend
 
 frontend:
 	cd frontend && bun run build
+	mkdir -p backend/web/static
+	cp frontend/public/index.html backend/web/static/ 2>/dev/null || true
+	cp -r frontend/public/pages backend/web/static/ 2>/dev/null || true
 
 backend:
 	cd backend && go build -o ./dist/aethera ./cmd
@@ -11,6 +14,7 @@ backend:
 clean:
 	rm -rf frontend/public/dist
 	rm -rf backend/dist
+	rm -rf backend/web/static
 
 dev:
 	cd backend && go run ./cmd --listen 0.0.0.0 &

backend/.gitignore

@@ -1 +1,2 @@
 dist
+web/static/

backend/internal/server/server.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"fmt"
+	"io/fs"
 	"net/http"
 	"path"
 	"time"
@@ -9,6 +10,7 @@ import (
 	"github.com/sirupsen/logrus"
 	"reichard.io/aethera/internal/api"
 	"reichard.io/aethera/internal/store"
+	"reichard.io/aethera/web"
 )
 
 func StartServer(settingsStore store.Store, dataDir, listenAddress string, listenPort int) {
@@ -17,12 +19,13 @@ func StartServer(settingsStore store.Store, dataDir, listenAddress string, liste
 	// Create API Instance - use settingsStore as the unified store for both settings and chat
 	logger := logrus.New()
 	api := api.New(settingsStore, dataDir, logger)
-	feFS := http.FileServer(http.Dir("../frontend/public/"))
-	mux.Handle("GET /", feFS)
 
-	// Serve UI Pages
-	pagesFS := http.FileServer(http.Dir("../frontend/public/pages/"))
-	mux.Handle("GET /pages/", http.StripPrefix("/pages/", pagesFS))
+	// Serve embedded static assets
+	staticFS, err := fs.Sub(web.Assets, "static")
+	if err != nil {
+		logrus.Fatal("Failed to create static filesystem: ", err)
+	}
+	mux.Handle("GET /", http.FileServer(http.FS(staticFS)))
 
 	// Serve Generated Data
 	genFS := http.FileServer(http.Dir(path.Join(dataDir, "generated")))

backend/web/embed.go

@@ -0,0 +1,6 @@
+package web
+
+import "embed"
+
+//go:embed static/*
+var Assets embed.FS

flake.nix

@@ -21,11 +21,6 @@
             config.allowUnfree = true;
           }
         );
-
-        oc = pkgs.writeShellScriptBin "oc" ''
-          PRJ_ROOT=$(git rev-parse --show-toplevel 2>/dev/null || pwd)
-          cd "$PRJ_ROOT" && OPENCODE_EXPERIMENTAL_LSP_TOOL=true opencode
-        '';
       in
       {
         devShells.default = pkgs.mkShell {
@@ -38,11 +33,11 @@
             # Frontend
             bun
             watchman
-            tailwindcss_4
-
-            # Custom Commands
-            oc
           ];
+
+          shellHook = ''
+            export LD_LIBRARY_PATH=${pkgs.stdenv.cc.cc.lib}/lib:$LD_LIBRARY_PATH
+          '';
         };
       }
     );

frontend/package.json

@@ -2,8 +2,8 @@
   "name": "aethera",
   "private": true,
   "scripts": {
-    "dev": "bun build src/main.ts --outdir public/dist --target browser --watch & bunx @tailwindcss/cli -i styles.css -o public/dist/styles.css --watch",
-    "build": "bun build src/main.ts --outdir public/dist --target browser && bunx @tailwindcss/cli -i styles.css -o public/dist/styles.css --minify",
+    "dev": "bun build src/main.ts --outdir public/dist --target browser --watch & bunx tailwindcss -i styles.css -o public/dist/styles.css --watch",
+    "build": "bun build src/main.ts --outdir ../backend/web/static/dist --target browser && bunx tailwindcss -i styles.css -o ../backend/web/static/dist/styles.css --minify",
     "lint": "eslint ./src/**"
   },
   "devDependencies": {