Remove remaining references to deprecated bundle stats APIs

Removes all remaining references to the deprecated bundle stats APIs:
- Removed Go example from quick-start.mdx that used flashbots_getUserStats
- Removed reference to flashbots_getUserStatsV2 in reputation.md
- Removed section about flashbots_getSbundleStats in gas-fee-refunds.md

These APIs were deprecated on June 9th and now return 403 errors.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: odysseus0

docs/flashbots-auction/advanced/gas-fee-refunds.md

@@ -59,10 +59,6 @@ Searchers can also use `mev_sendBundle` to multiplex bundles if they prefer. Thi
 
 _Note: Smart multiplexing has a 1% rate of false positives, meaning that in 1% of MEV-Boost blocks there is a risk that searcher bundles will not be landed._
 
-### Bundle stats for multiplexed bundles
-
-To view bundle stats on multiplexed `eth_sendBundle` requests, use the `flashbots_getSbundleStats` API. You will see a new "smart" field in the response to multiplexed `eth_sendBundle` which indicates that the sbundle stats endpoint should be used.
-
 ## How are refunds calculated
 
 BuilderNet uses a refund rule to retroactively calculate refunds for all bundles landed in its blocks. For more information, see the [BuilderNet docs](https://buildernet.org/docs/refunds).

docs/flashbots-auction/advanced/reputation.md

@@ -27,8 +27,6 @@ $\Delta_{coinbase_T}$: coinbase difference from direct payment in transaction $T
 
 Flashbots uses a dynamic threshold to classify users between the high reputation and low reputation queue. The dynamic variables are: 1) the historical time period considered to calculate reputation, 2) the cutoff reputation score which classifies a searcher as "high reputation". Using a dynamic threshold allows the builder to adapt in periods of high demand and maintain high reliability for top searchers.
 
-A searcher can query their current reputation status using the [`flashbots_getUserStatsV2` RPC method](/flashbots-auction/advanced/rpc-endpoint#flashbots_getuserstatsv2).
-
 ## Building reputation
 
 Searcher reputation is associated with the signing key used to authenticate with Flashbots. That is, the ethereum address associated with the `X-Flashbots-Signature` field of your bundle submission.

docs/flashbots-auction/quick-start.mdx

@@ -48,7 +48,6 @@ Next, you need a means to communicate with the Flashbots network. The Flashbots
   values={[
     { label: 'ethers.js', value: 'ethers.js', },
     { label: 'web3.py', value: 'web3.py' },
-    { label: 'go', value: 'go' },
 	{ label: 'rust', value: 'rust'},
   ]}
 >
@@ -101,74 +100,6 @@ ETH_ACCOUNT_SIGNATURE: LocalAccount = Account.from_key(os.environ.get("ETH_SIGNA
 flashbot(w3, ETH_ACCOUNT_SIGNATURE)
 ```
 
-</TabItem>
-<TabItem value="go">
-
-```go
-package main
-
-import (
-	"bytes"
-	"crypto/ecdsa"
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"math/big"
-	"net/http"
-	"time"
-
-	"github.com/ethereum/go-ethereum/accounts"
-	"github.com/ethereum/go-ethereum/common/hexutil"
-	"github.com/ethereum/go-ethereum/crypto"
-)
-
-const (
-	j               = "application/json"
-	flashbotURL     = "https://relay.flashbots.net"
-	stats           = "flashbots_getUserStats"
-	flashbotXHeader = "X-Flashbots-Signature"
-	p               = "POST"
-)
-
-var (
-	privateKey, _ = crypto.HexToECDSA(
-		"2e19800fcbbf0abb7cf6d72ee7171f08943bc8e5c3568d1d7420e52136898154",
-	)
-)
-
-func flashbotHeader(signature []byte, privateKey *ecdsa.PrivateKey) string {
-	return crypto.PubkeyToAddress(privateKey.PublicKey).Hex() +
-		":" + hexutil.Encode(signature)
-}
-
-func main() {
-	mevHTTPClient := &http.Client{
-		Timeout: time.Second * 3,
-	}
-	currentBlock := big.NewInt(12_900_000)
-	params := map[string]interface{}{
-		"jsonrpc": "2.0",
-		"id":      1,
-		"method":  stats,
-		"params": []interface{}{
-			fmt.Sprintf("0x%x", currentBlock.Uint64()),
-		},
-	}
-	payload, _ := json.Marshal(params)
-	req, _ := http.NewRequest(p, flashbotURL, bytes.NewBuffer(payload))
-	headerReady, _ := crypto.Sign(
-		accounts.TextHash([]byte(hexutil.Encode(crypto.Keccak256(payload)))),
-		privateKey,
-	)
-	req.Header.Add("content-type", j)
-	req.Header.Add("Accept", j)
-	req.Header.Add(flashbotXHeader, flashbotHeader(headerReady, privateKey))
-	resp, _ := mevHTTPClient.Do(req)
-	res, _ := ioutil.ReadAll(resp.Body)
-	fmt.Println(string(res))
-}
-```
-
 </TabItem>
 <TabItem value="rust">