feat(web): settings view for roots and policies

Own route beside library and queues. Roots edit kind, audience, path
and their policy; policies get a form over the real fields — size
bands as number inputs, score and source weights as numbers,
resolution preference and audio/HDR rules as validated lists. Delete
arms before firing; a 409 from a referenced policy or occupied root
surfaces its message.

crates/arr-api/src/policies.rs

@@ -141,7 +141,7 @@ impl PolicyInput {
         Ok(())
     }
 
-    fn to_row(self, name: String) -> Result<PolicyColumns, ApiError> {
+    fn into_columns(self, name: String) -> Result<PolicyColumns, ApiError> {
         fn json(value: impl serde::Serialize) -> Result<String, ApiError> {
             serde_json::to_string(&value).map_err(|error| {
                 tracing::error!(%error, "policy serialisation failed");
@@ -151,12 +151,12 @@ impl PolicyInput {
         Ok(PolicyColumns {
             name,
             required_audio: json(&self.required_audio)?,
-            dub_blacklist: json(&self.dub_blacklist)?,
-            hdr_rules: json(&self.hdr_rules)?,
-            size_bands: json(&self.size_bands)?,
-            resolution_pref: json(&self.resolution_pref)?,
-            source_weights: json(&self.source_weights)?,
-            score_weights: json(&self.score_weights)?,
+            dub_blacklist: json(self.dub_blacklist)?,
+            hdr_rules: json(self.hdr_rules)?,
+            size_bands: json(self.size_bands)?,
+            resolution_pref: json(self.resolution_pref)?,
+            source_weights: json(self.source_weights)?,
+            score_weights: json(self.score_weights)?,
         })
     }
 }
@@ -327,7 +327,7 @@ pub async fn create(
     let input = parsed(body)?;
     input.validate().map_err(ApiError::Invalid)?;
     let name = input.name.trim().to_owned();
-    let columns = input.to_row(name)?;
+    let columns = input.into_columns(name)?;
     let result = sqlx::query!(
         r#"INSERT INTO policies (
                name, required_audio, dub_blacklist, hdr_rules,
@@ -375,7 +375,7 @@ pub async fn update(
     let input = parsed(body)?;
     input.validate().map_err(ApiError::Invalid)?;
     let name = input.name.trim().to_owned();
-    let columns = input.to_row(name)?;
+    let columns = input.into_columns(name)?;
     let result = sqlx::query!(
         r#"UPDATE policies SET
                name = ?, required_audio = ?, dub_blacklist = ?, hdr_rules = ?,