feat: add SQLite support, setup wizard enhancements, and live dashboard

Add zero-dependency SQLite mode so users can run Erupe without
PostgreSQL. A transparent db.DB wrapper auto-translates PostgreSQL
SQL ($N placeholders, now(), ::casts, ILIKE, public. prefix,
TRUNCATE) for SQLite at runtime — all 28 repo files use the wrapper
with no per-query changes needed.

Setup wizard gains two new steps: quest file detection with download
link, and gameplay presets (solo/small/community/rebalanced). The API
server gets a /dashboard endpoint with auto-refreshing stats.

CI release workflow now builds and pushes Docker images to GHCR
alongside binary artifacts on tag push.

Key changes:
- common/db: DB/Tx wrapper with 6 SQL translation rules
- server/migrations/sqlite: full SQLite schema (0001-0005)
- config: Database.Driver field ("postgres" or "sqlite")
- main.go: SQLite connection with WAL mode, single writer
- server/setup: quest check + preset selection steps
- server/api: /dashboard with live stats
- .github/workflows: Docker in release, deduplicate docker.yml

server/channelserver/handlers_shop.go

@@ -156,13 +156,13 @@ func handleMsgMhfEnumerateShop(s *Session, p mhfpacket.MHFPacket) {
 				// 	|5|1|1|7|9|3|0|0|0|0|0|null|
 				// 	|8|1|100|7|1|4|1000|0|0|0|0|null|
 				// 	|9|1|100|7|2|5|9000|0|0|0|0|null|
-				bf.WriteUint8(ge.EntryType)     
-				bf.WriteUint32(ge.ID)           
-				bf.WriteUint8(ge.ItemType)      
-				bf.WriteUint32(ge.ItemNumber)   
-				bf.WriteUint16(ge.ItemQuantity) 
+				bf.WriteUint8(ge.EntryType)
+				bf.WriteUint32(ge.ID)
+				bf.WriteUint8(ge.ItemType)
+				bf.WriteUint32(ge.ItemNumber)
+				bf.WriteUint16(ge.ItemQuantity)
 				var weightPr uint16
-				if gachaType >= 4 { // If box   
+				if gachaType >= 4 { // If box
 					weightPr = 1
 				} else {
 					weightPr = uint16(ge.Weight / divisor)