fix: proxy uses undici ProxyAgent for fetch, schedule moved to .env, verbose redeem logging

- Fix proxy: native fetch needs undici ProxyAgent with dispatcher option
  (https-proxy-agent only works with axios, not Node's built-in fetch)
- Move schedule from hardcoded to .env: SNIPER_SCHEDULE_BTC=19:40-22:40,03:40-06:10
- Add verbose logging to redeemSniperPositions for debugging
- Config dynamically reads all SNIPER_SCHEDULE_* env vars

src/services/ctf.js

@@ -560,13 +560,19 @@ export async function redeemSniperPositions() {
     let dataPositions = [];
     try {
         const resp = await proxyFetch(`${config.dataHost}/positions?user=${config.proxyWallet}`);
-        if (resp.ok) dataPositions = await resp.json();
+        if (!resp.ok) {
+            logger.warn(`SNIPER redeemer: Data API returned ${resp.status} — will retry`);
+            return;
+        }
+        dataPositions = await resp.json();
         if (!Array.isArray(dataPositions)) dataPositions = [];
-    } catch {
-        return; // silent — will retry next interval
+    } catch (err) {
+        logger.warn(`SNIPER redeemer: Data API fetch failed — ${err.message}`);
+        return;
     }
 
     if (dataPositions.length === 0) return;
+    logger.info(`SNIPER redeemer: checking ${dataPositions.length} position(s)...`);
 
     const provider = await getPolygonProvider();
     const ctf = new ethers.Contract(CTF_ADDRESS, CTF_ABI, provider);