feat(storage): migrate config, dedup and delivery state to D1

- Move oversized queue payloads from KV to R2 (PAYLOAD binding, webhooks/YYYY/MM/DD/*.json, KV queue:payload:* fallback)
- Persist routes/groups to D1 (d1_routes/d1_groups) with memory -> KV -> D1 three-tier cache, seeded from legacy KV config keys
- Move webhook dedup (dedup_keys), delivery state (delivery_state) and message tracking (message_tracking) to D1 via canUseD1 probe with automatic KV fallback
- Batch send_logs inserts (recordSendBatch) and add group_id/ts index
- Add storage-prune scheduled task for expired dedup/state/tracking rows
- Add TTL to invite:group:{id} index and audit all ephemeral KV keys
- Add D1 indexes for the new tables
- Sync AGENTS.md, README.md/zh and docs/ (en/zh) with the new storage layout

nuxt.config.ts

@@ -9,7 +9,7 @@ export default defineNuxtConfig({
       tasks: true,
     },
     scheduledTasks: {
-      "*/5 * * * *": ["discord-sync", "telegram-sync", "audit-prune"],
+      "*/5 * * * *": ["discord-sync", "telegram-sync", "audit-prune", "storage-prune"],
     },
   },
   app: {