fix(docker): Dockerfile workspace-aware + db.rs create_if_missing

- Contexte de build depuis la racine du workspace Cargo
- Rust 1.86 pour edition 2024
- Layer cache avec stubs membres du workspace
- Création répertoire /data dans l'image
- SQLite create_if_missing(true) pour créer la DB au premier démarrage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/Dockerfile

@@ -1,13 +1,26 @@
-FROM rust:1.82-alpine AS builder
+FROM rust:1.86-alpine AS builder
 RUN apk add --no-cache musl-dev
 WORKDIR /app
-COPY Cargo.toml Cargo.lock* ./
-COPY src ./src
-RUN cargo build --release
+# Workspace
+COPY Cargo.toml Cargo.lock ./
+COPY backend/Cargo.toml ./backend/Cargo.toml
+COPY agents/agent-scan-network/Cargo.toml ./agents/agent-scan-network/Cargo.toml
+COPY agents/agent-metric/Cargo.toml ./agents/agent-metric/Cargo.toml
+# Stubs pour cacher les dépendances
+RUN mkdir -p backend/src agents/agent-scan-network/src agents/agent-metric/src \
+    && echo 'fn main(){}' > backend/src/main.rs \
+    && echo 'fn main(){}' > agents/agent-scan-network/src/main.rs \
+    && echo 'fn main(){}' > agents/agent-metric/src/main.rs \
+    && cargo build --release -p sentinelmesh-backend
+# Sources réelles (les stubs agents restent en place)
+COPY backend/src ./backend/src
+COPY backend/migrations ./backend/migrations
+RUN touch backend/src/main.rs && cargo build --release -p sentinelmesh-backend
 
 FROM alpine:3.21
-RUN apk add --no-cache ca-certificates
+RUN apk add --no-cache ca-certificates && mkdir -p /data
 WORKDIR /app
 COPY --from=builder /app/target/release/sentinelmesh-backend .
+COPY --from=builder /app/backend/migrations ./migrations
 EXPOSE 8080
 CMD ["./sentinelmesh-backend"]

backend/src/db.rs

@@ -1,9 +1,13 @@
-use sqlx::{sqlite::SqlitePoolOptions, SqlitePool};
+use sqlx::{sqlite::{SqliteConnectOptions, SqlitePoolOptions}, SqlitePool};
+use std::str::FromStr;
 
 pub async fn connect(database_url: &str) -> anyhow::Result<SqlitePool> {
+    let opts = SqliteConnectOptions::from_str(database_url)?
+        .create_if_missing(true);
+
     let pool = SqlitePoolOptions::new()
         .max_connections(5)
-        .connect(database_url)
+        .connect_with(opts)
         .await?;
 
     sqlx::migrate!("./migrations").run(&pool).await?;

docker-compose.yml

@@ -1,8 +1,8 @@
 services:
   backend:
     build:
-      context: ./backend
-      dockerfile: Dockerfile
+      context: .
+      dockerfile: backend/Dockerfile
     image: sentinelmesh-backend:latest
     container_name: sentinelmesh-backend
     ports: