releaseparser: move group-agnostic parser to groups/, GB doc-blocks, per-group JSON reports

Generalise the parser: the MOONBLOOD group profile is gone, the parser and
its dictionaries are now group-agnostic under internal/releaseparser/groups.

Positional model:
- [0]=Artist, [1]=Title are fixed and never matched against dictionaries, so
  titles like "Split"/"Demo"/"De" are never eaten.
- [len-1]=Group is always read from the line, not from the query key.
- [len-2]=Year when it is a 4-digit 19xx|20xx token; otherwise the slot is
  resolved as a middle-zone token (e.g. FLAC is still picked up as format).
- The middle zone is resolved via case-insensitive dictionaries in the order
  format -> source -> bit-depth -> resolution -> edition -> language ->
  catalogue number; stored values keep their original case.

Catalogue numbers: any "(...)" token in the middle zone is a catalogue number
regardless of content (digits, roman numerals, dots, underscores, mixed case);
splitting never breaks tokens inside parentheses.

Dictionaries moved to internal/releaseparser/groups/resources/dicts and
embedded via go:embed; dead profile fields (Name, ExpectedTailOrder) removed;
profile comments rewritten in British English.

File-based AnalyzeGroup/TestParseMoonblood removed — titles now come from the
database (cmd/srrdb: srrdb <releaser>..., config/secret.yaml DSN).

Validation output (cmd/srrdb):
- tmp/releaseparser/<group>.json         — per-group parsed ParsedRelease records
- tmp/releaseparser/<releaser>.report.json — per-request aggregate (same as console)
- review_unknown_tokens.txt              — unknown/warning rows for manual review

Tests updated for the positional model; added
TestParseCatalogNumberWithDotAndRoman for (DYN.3140-2) and (GOWP_DCCCLXXXIX).
go build, go vet and go test all pass.

internal/releaseparser/groups/analyzer.go

@@ -0,0 +1,161 @@
+package groups
+
+import (
+	"sort"
+	"strings"
+
+	"git.kplus.net.ua/yevhen/resource-scraper/internal/releaseparser"
+)
+
+// GroupStats summarises how a set of release lines parsed: field
+// distributions, unknown tokens and warnings aggregated by occurrence, and
+// the average parsing confidence. The slices are sorted by descending count.
+
+type GroupStats struct {
+	Total                  int
+	YearDistribution       map[int]int
+	SourceDistribution     map[string]int
+	BitDepthDistribution   map[string]int
+	ResolutionDistribution map[string]int
+	LanguageDistribution   map[string]int
+	EditionDistribution    map[string]int
+	CommentDistribution    map[string]int
+	UnknownTokens          []releaseparser.UnknownTokenStats
+	WarningStats           []releaseparser.UnknownTokenStats
+	AvgConfidence          float64
+}
+
+
+// AnalyzeTitles parses a set of release lines (for example fetched from the
+// database by a particular releaser key) and aggregates the results into a
+// GroupStats summary.
+
+func AnalyzeTitles(titles []string) GroupStats {
+	stats := GroupStats{
+		YearDistribution:       make(map[int]int),
+		SourceDistribution:     make(map[string]int),
+		BitDepthDistribution:   make(map[string]int),
+		ResolutionDistribution: make(map[string]int),
+		LanguageDistribution:   make(map[string]int),
+		EditionDistribution:    make(map[string]int),
+		CommentDistribution:    make(map[string]int),
+		UnknownTokens:          []releaseparser.UnknownTokenStats{},
+		WarningStats:           []releaseparser.UnknownTokenStats{},
+	}
+
+
+	totalConfidence := 0.0
+	unknownMap := make(map[string]*releaseparser.UnknownTokenStats)
+	warningMap := make(map[string]*releaseparser.UnknownTokenStats)
+
+
+	for _, title := range titles {
+		result := Parse(title)
+		stats.Total++
+
+		if result.Year != 0 {
+			stats.YearDistribution[result.Year]++
+		}
+		if result.Source != "" {
+			stats.SourceDistribution[result.Source]++
+		}
+		if result.BitDepth != "" {
+			stats.BitDepthDistribution[result.BitDepth]++
+		}
+		if result.Resolution != "" {
+			stats.ResolutionDistribution[result.Resolution]++
+		}
+		if result.Language != "" {
+			stats.LanguageDistribution[result.Language]++
+		}
+		if result.Edition != "" {
+			stats.EditionDistribution[result.Edition]++
+		}
+		if result.Comment != "" {
+			for _, c := range strings.Split(result.Comment, ",") {
+				stats.CommentDistribution[c]++
+			}
+		}
+
+		for _, unknown := range result.UnknownTokens {
+			if _, exists := unknownMap[unknown]; !exists {
+				unknownMap[unknown] = &releaseparser.UnknownTokenStats{
+					Token:    unknown,
+					Count:    0,
+					Releases: []string{},
+				}
+			}
+			unknownMap[unknown].Count++
+			unknownMap[unknown].Releases = append(unknownMap[unknown].Releases, title)
+		}
+
+		for _, warning := range result.Warnings {
+			if _, exists := warningMap[warning]; !exists {
+				warningMap[warning] = &releaseparser.UnknownTokenStats{
+					Token:    warning,
+					Count:    0,
+					Releases: []string{},
+				}
+			}
+			warningMap[warning].Count++
+			warningMap[warning].Releases = append(warningMap[warning].Releases, title)
+		}
+
+		totalConfidence += result.Confidence
+	}
+
+	// Convert the aggregates from maps to slices and order them by count
+	// (most frequent first).
+	for _, tokenStats := range unknownMap {
+		stats.UnknownTokens = append(stats.UnknownTokens, *tokenStats)
+	}
+	sort.Slice(stats.UnknownTokens, func(i, j int) bool {
+		return stats.UnknownTokens[i].Count > stats.UnknownTokens[j].Count
+	})
+
+	for _, w := range warningMap {
+		stats.WarningStats = append(stats.WarningStats, *w)
+	}
+	sort.Slice(stats.WarningStats, func(i, j int) bool {
+		return stats.WarningStats[i].Count > stats.WarningStats[j].Count
+	})
+
+	if stats.Total > 0 {
+		stats.AvgConfidence = totalConfidence / float64(stats.Total)
+	}
+
+	return stats
+}
+
+
+// AnalyzeByGroup parses a set of release lines and returns per-group
+// statistics keyed by the actual group read from each line (not from the
+// query key, which may cover several groups). It is used to validate parsing
+// quality against the original data, grouped by the real releaser name.
+func AnalyzeByGroup(titles []string) map[string]GroupStats {
+	byGroup := make(map[string][]string)
+	for _, title := range titles {
+		group := Parse(title).Group
+		byGroup[group] = append(byGroup[group], title)
+	}
+
+	out := make(map[string]GroupStats, len(byGroup))
+	for group, lines := range byGroup {
+		out[group] = AnalyzeTitles(lines)
+	}
+	return out
+}
+
+
+// ParseByGroup parses a set of release lines into a per-group list of fully
+// populated ParsedRelease records, keyed by the actual group read from each
+// line. It is used to validate parsing quality field-by-field against the
+// original data.
+func ParseByGroup(titles []string) map[string][]releaseparser.ParsedRelease {
+	byGroup := make(map[string][]releaseparser.ParsedRelease)
+	for _, title := range titles {
+		result := Parse(title)
+		byGroup[result.Group] = append(byGroup[result.Group], result)
+	}
+	return byGroup
+}