srrdb: harvest the srrDB search API into a separate SQLite database

New scope reading the API instead of scraping HTML: one search path per run,
passed raw through --single-uri, and the answer stored as-is into its own
SQLite file created from the embedded schema.

Command line: --single-uri carries the path after /v1/search/
(category:flac/date:today/page:1) and must name a category; --sleep sets the
pause between pages, with the config value as fallback. A day named on the
command line is always fetched again and its dump rewritten, so cron can
refresh today hourly and yesterday daily.

Date placeholders: date:auto walks backwards to the newest day in
[srrdb.floor..yesterday] that has no dump yet, closing holes instead of
declaring the archive covered. date:today, date:yesterday and date:tomorrow
stand for the neighbouring days. Today is never taken by the walk, because a
day still being filled would be frozen by its own dump after the first run.

Dumps are the cursor as well as the record, so a missing dump directory is an
error instead of "nothing harvested yet": a renamed, unmounted or mistyped
directory must not send the run silently back to the beginning. An empty day is
a normal result and is remembered as harvested; API warnings never are, and
they reach the exit code.

Writes go through one transaction, so a day lands completely or not at all.
group and category come from the release line and the search path; status, nfo,
content and synced_at stay NULL. srrdb.log.jsonl records one line per finished
run, srrdb.error_log.jsonl keeps failures and API warnings apart by a kind
field.

Also: the console command contract returns (string, error), so a failing scope
reaches the process exit code and cron can tell a failed run from a successful
one. config/scope/srrdb.yaml is untracked because its paths differ per host.
modernc.org/sqlite replaces the archived libsql client, which only ever talked
to a server. pkg/repository/srrdb.go is split by responsibility and covered by
table-driven tests.

pkg/repository/srrdb_row.go

@@ -0,0 +1,61 @@
+package repository
+
+import (
+	"regexp"
+	"strings"
+
+	"git.kplus.net.ua/yevhen/resource-scraper/types/model"
+	"git.kplus.net.ua/yevhen/resource-scraper/types/resource"
+)
+
+// srrdbGroupSegment cuts the group off the tail of a release line, which always
+// sits last. Compiled once at package level instead of per record.
+//
+// The pattern takes the trailing word, so a group whose own name contains a
+// hyphen or a dot would lose everything before that character. Nothing in the
+// line tells such a name apart from the tokens in front of it, so widening the
+// character class without a list of real group names would only start eating the
+// title.
+var srrdbGroupSegment = regexp.MustCompile(`-(\w+)$`)
+
+// srrdbCategory reads the value of the category: segment of a search path, which
+// is guaranteed to be present by the time this is called.
+func srrdbCategory(uri string) string {
+	_, rest, ok := strings.Cut(uri, "category:")
+	if !ok {
+		return ""
+	}
+
+	value, _, _ := strings.Cut(rest, "/")
+
+	return value
+}
+
+// srrdbRow maps one API record onto a table row. status, nfo, content and
+// synced_at stay nil and are stored as NULL.
+func srrdbRow(result resource.SrrdbResult, run, category string) model.SrrdbRelease {
+	return model.SrrdbRelease{
+		Release:   result.Release,
+		Date:      result.Date,
+		HasNfo:    result.HasNFO,
+		HasSrs:    result.HasSRS,
+		IsForeign: result.IsForeign,
+		ImdbID:    result.ImdbID,
+		Size:      result.Size,
+		GroupName: srrdbGroupName(result.Release),
+		Category:  category,
+		CreatedAt: run,
+	}
+}
+
+// srrdbGroupName returns the trailing group of a release line, or an empty
+// string when the tail is not a plain word. The nil check is deliberate:
+// FindStringSubmatch returns nil on no match, and indexing it directly panics.
+func srrdbGroupName(release string) string {
+	match := srrdbGroupSegment.FindStringSubmatch(release)
+	if match == nil {
+		return ""
+	}
+
+	return match[1]
+}