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/handler/prescene.go

@@ -2,7 +2,6 @@ package handler
 
 import (
 	"fmt"
-	"log/slog"
 	"math"
 	"strconv"
 	"time"
@@ -12,7 +11,7 @@ import (
 	"git.kplus.net.ua/yevhen/resource-scraper/types/constant"
 )
 
-func (h *Handler) Prescene() string {
+func (h *Handler) Prescene() (string, error) {
 	currMinute := time.Now().Minute()
 	levels := viper.GetInt(constant.CfgKeyLevelsToScrape)
 	initPage := strconv.Itoa(currMinute/(60/levels) + 1)
@@ -30,17 +29,15 @@ func (h *Handler) Prescene() string {
 		pagesToScrape = append(pagesToScrape, strconv.Itoa(page))
 	}
 
-	_, err := h.services.Prescene.GetSrrDb()
-	if err != nil {
-		slog.Error("error occurred while getting page: ", "err", err.Error())
+	if _, err := h.services.Prescene.GetSrrDb(); err != nil {
+		return "ps", fmt.Errorf("getting srr db: %w", err)
 	}
 
-	_, err = h.services.Prescene.GetPage(pagesToScrape)
-	if err != nil {
-		slog.Error("error occurred while getting page: ", "err", err.Error())
+	if _, err := h.services.Prescene.GetPage(pagesToScrape); err != nil {
+		return "ps", fmt.Errorf("getting page: %w", err)
 	}
 
 	fmt.Printf("%+v\n", pagesToScrape)
 
-	return "ps"
+	return "ps", nil
 }