feat(harmonia-host): acquisition startup wiring (P101)

crates/harmonia-host/Cargo.toml

@@ -19,10 +19,18 @@ taxis.workspace = true
 epignosis.workspace = true
 kritike.workspace = true
 komide.workspace = true
+zetesis.workspace = true
+ergasia.workspace = true
+syntaxis.workspace = true
+aitesis.workspace = true
+syndesmos.workspace = true
+prostheke.workspace = true
 clap.workspace = true
 tokio.workspace = true
+tokio-util.workspace = true
 axum.workspace = true
 reqwest.workspace = true
+sqlx.workspace = true
 snafu.workspace = true
 tracing.workspace = true
 tracing-subscriber.workspace = true

crates/harmonia-host/src/error.rs

@@ -2,6 +2,7 @@ use snafu::Snafu;
 
 #[derive(Debug, Snafu)]
 #[snafu(visibility(pub))]
+#[expect(dead_code, reason = "variants used as subsystems gain route handlers")]
 pub enum HostError {
     #[snafu(display("configuration error: {source}"))]
     Config {
@@ -54,4 +55,52 @@ pub enum HostError {
         #[snafu(implicit)]
         location: snafu::Location,
     },
+
+    #[snafu(display("indexer error: {source}"))]
+    Indexer {
+        #[snafu(source(from(zetesis::ZetesisError, Box::new)))]
+        source: Box<zetesis::ZetesisError>,
+        #[snafu(implicit)]
+        location: snafu::Location,
+    },
+
+    #[snafu(display("download engine error: {source}"))]
+    DownloadEngine {
+        #[snafu(source(from(ergasia::ErgasiaError, Box::new)))]
+        source: Box<ergasia::ErgasiaError>,
+        #[snafu(implicit)]
+        location: snafu::Location,
+    },
+
+    #[snafu(display("download queue error: {source}"))]
+    DownloadQueue {
+        #[snafu(source(from(syntaxis::SyntaxisError, Box::new)))]
+        source: Box<syntaxis::SyntaxisError>,
+        #[snafu(implicit)]
+        location: snafu::Location,
+    },
+
+    #[snafu(display("request service error: {source}"))]
+    RequestService {
+        #[snafu(source(from(aitesis::AitesisError, Box::new)))]
+        source: Box<aitesis::AitesisError>,
+        #[snafu(implicit)]
+        location: snafu::Location,
+    },
+
+    #[snafu(display("external integration error: {source}"))]
+    ExternalIntegration {
+        #[snafu(source(from(syndesmos::SyndesmodError, Box::new)))]
+        source: Box<syndesmos::SyndesmodError>,
+        #[snafu(implicit)]
+        location: snafu::Location,
+    },
+
+    #[snafu(display("subtitle service error: {source}"))]
+    SubtitleService {
+        #[snafu(source(from(prostheke::ProsthekeError, Box::new)))]
+        source: Box<prostheke::ProsthekeError>,
+        #[snafu(implicit)]
+        location: snafu::Location,
+    },
 }