fix(awards): add a Prefix field to the primary QSOFIELDS search

Only OrRule had a Prefix ("prepended to each found reference", e.g. postal 74 →
D74); the primary search passed "" for prefix, so an award whose references are
D01/D02… couldn't prepend the D on its main rule — only on OR fallbacks. Add
Def.Prefix, pass it into the primary run(), and expose a Prefix input next to the
primary Leading/Trailing fields in the award editor.

internal/award/award.go

@@ -74,6 +74,7 @@ type Def struct {
 	Pattern     string    `json:"pattern"`                // award-level Go regexp; group 1 = reference
 	LeadingStr  string    `json:"leading_str,omitempty"`  // strip this prefix before matching
 	TrailingStr string    `json:"trailing_str,omitempty"` // strip this suffix before matching
+	Prefix      string    `json:"prefix,omitempty"`       // prepended to each found reference (e.g. captured "01" + "D" → "D01"), same as OrRule.Prefix
 	Dynamic     bool      `json:"dynamic,omitempty"`      // references not predefined (any value counts)
 	// OneRefPerQSO refuses an AMBIGUOUS match rather than guessing.
 	//
@@ -960,7 +961,7 @@ func candidatesTrace(d *Def, re *regexp.Regexp, q *qso.QSO, rl refList, hasList
 	// Testing the raw candidate would call that a hit, skip every fallback, and
 	// only then drop it as unlisted — leaving the QSO unmatched even though the
 	// next rule ("find the code inside the QTH") would have found BG.
-	found := run("primary", d.Field, d.MatchBy, d.Pattern, re, d.ExactMatch, d.LeadingStr, d.TrailingStr, "")
+	found := run("primary", d.Field, d.MatchBy, d.Pattern, re, d.ExactMatch, d.LeadingStr, d.TrailingStr, d.Prefix)
 	for i := range d.OrRules {
 		r := &d.OrRules[i]
 		label := fmt.Sprintf("OR %d", i+1)