chore: harden common storage bootstrap and slim embedded db assets

Unify embedding config, build providers from system settings, and fail
startup when index builds error or time out. Move Surreal assets under
common/db so embeds exclude crate source, and read storage via streams.

main/src/bootstrap/startup.rs

@@ -0,0 +1,66 @@
+use anyhow::Context;
+use common::{
+    storage::{
+        db::SurrealDbClient,
+        indexes::ensure_runtime,
+        types::{
+            knowledge_entity::KnowledgeEntity, system_settings::SystemSettings,
+            text_chunk::TextChunk,
+        },
+    },
+    utils::embedding::EmbeddingProvider,
+};
+use tracing::{info, warn};
+
+use super::SharedServices;
+
+/// Syncs embedding settings, re-embeds stored vectors when dimensions change, and
+/// ensures runtime indexes match the active embedding dimension.
+pub async fn prepare_embedding_runtime(services: &SharedServices) -> anyhow::Result<SystemSettings> {
+    let (settings, dimensions_changed) =
+        SystemSettings::sync_from_embedding_provider(&services.db, &services.embedding_provider)
+            .await
+            .context("sync system settings from embedding provider")?;
+
+    if dimensions_changed {
+        re_embed_all(
+            &services.db,
+            &services.embedding_provider,
+            settings.embedding_dimensions,
+        )
+        .await?;
+    }
+
+    ensure_runtime(
+        &services.db,
+        settings.embedding_dimensions as usize,
+    )
+    .await
+    .context("ensure runtime indexes")?;
+
+    Ok(settings)
+}
+
+async fn re_embed_all(
+    db: &SurrealDbClient,
+    embedding_provider: &EmbeddingProvider,
+    embedding_dimensions: u32,
+) -> anyhow::Result<()> {
+    warn!(
+        embedding_dimensions,
+        "Embedding configuration changed; re-embedding existing data"
+    );
+
+    info!("Re-embedding TextChunks");
+    TextChunk::update_all_embeddings_with_provider(db, embedding_provider)
+        .await
+        .context("re-embed text chunks after embedding dimension change")?;
+
+    info!("Re-embedding KnowledgeEntities");
+    KnowledgeEntity::update_all_embeddings_with_provider(db, embedding_provider)
+        .await
+        .context("re-embed knowledge entities after embedding dimension change")?;
+
+    info!("Re-embedding complete");
+    Ok(())
+}