feat: scale size bands by episode runtime

Implements #209 per §5.5 as amended by #208: a band's floor and target
are rates against a 45-minute reference runtime, scaled by the series'
minutes per episode. A missing or zero runtime applies the bands
unscaled, and movies are never scaled. The runtime is stored on the
series row (new migration), filled on add and by the metadata refresh,
which never blanks a known value against TMDB's frequently-empty
episode_run_time. Composes with #210: allow_below_floor waives against
the scaled floor.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/arr-daemon/src/import.rs

@@ -308,6 +308,7 @@ impl ImportAction {
             Candidate::PostDownload(&feature.media),
             Some(feature.size),
             1,
+            0,
         );
         let waiver: Option<Rule> = match evaluation.verdict {
             Verdict::Rejected(rule) => {
@@ -477,6 +478,10 @@ impl ImportAction {
         // §5.6 second phase of truth, over every file that would be
         // imported, before anything is placed: one hard failure condemns
         // the whole release (§5.7), not the episodes.
+        let runtime_minutes = pending
+            .runtime_minutes
+            .and_then(|minutes| u32::try_from(minutes).ok())
+            .unwrap_or(0);
         let mut imports = Vec::new();
         for assignment in assignments {
             if assignment.episode.has_file {
@@ -496,6 +501,7 @@ impl ImportAction {
                 Candidate::PostDownload(&assignment.file.media),
                 Some(assignment.file.size),
                 1,
+                runtime_minutes,
             );
             let waiver = match evaluation.verdict {
                 Verdict::Rejected(rule) => {
@@ -938,6 +944,10 @@ struct PendingTvImport {
     series_title: String,
     series_year: Option<i64>,
     original_language: Option<String>,
+    /// §5.5: the series' minutes per episode, scaling the size bands the
+    /// same way the pre-grab verdict scaled them. `None` applies them
+    /// unscaled.
+    runtime_minutes: Option<i64>,
     release_name: String,
 }
 
@@ -974,6 +984,7 @@ async fn pending_tv_imports(database: &Db) -> Result<Vec<PendingTvImport>, Impor
                  s.title    AS "series_title!: String",
                  s.year     AS "series_year",
                  s.original_language,
+                 s.runtime_minutes,
                  r.name     AS "release_name!: String"
         FROM     grabs g
         JOIN     episodes e ON e.id = g.target_id
@@ -997,6 +1008,7 @@ async fn pending_tv_imports(database: &Db) -> Result<Vec<PendingTvImport>, Impor
         series_title: row.series_title,
         series_year: row.series_year,
         original_language: row.original_language,
+        runtime_minutes: row.runtime_minutes,
         release_name: row.release_name,
     }));
 
@@ -1011,6 +1023,7 @@ async fn pending_tv_imports(database: &Db) -> Result<Vec<PendingTvImport>, Impor
                  s.title    AS "series_title!: String",
                  s.year     AS "series_year",
                  s.original_language,
+                 s.runtime_minutes,
                  r.name     AS "release_name!: String"
         FROM     grabs g
         JOIN     seasons se ON se.id = g.target_id
@@ -1033,6 +1046,7 @@ async fn pending_tv_imports(database: &Db) -> Result<Vec<PendingTvImport>, Impor
         series_title: row.series_title,
         series_year: row.series_year,
         original_language: row.original_language,
+        runtime_minutes: row.runtime_minutes,
         release_name: row.release_name,
     }));