doc: Update Phira Showcase Image Link in README

[YuevUwU]

Preview the changes [here]

Issue

The old https://files-cf.phira.cn/github-showcase.png returns error code 521: Web server is down,
which has migrated to https://phira.5wyxi.com/files/github-showcase.png

Changes

• Update the link to: https://phira.5wyxi.com/files/github-showcase.png
• Update the alt from "Phira" to "Phira Showcase"
• Sync them between README.md and README-zh_CN.md

NOTICE

Unstable GitHub Camo

Maybe some header, auth, redirect, or other limitation
It's UNSTABLE whether or not you successfully add as GitHub Camo.

cURL Log

alan54692@MSI:~/phira$ curl -v https://phira.5wyxi.com/files/github-showcase.png
* Host phira.5wyxi.com:443 was resolved.
* IPv6: (none)
* IPv4: 101.35.254.112
*   Trying 101.35.254.112:443...
* Connected to phira.5wyxi.com (101.35.254.112) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: /etc/ssl/certs
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384 / X25519 / RSASSA-PSS
* ALPN: server accepted http/1.1
* Server certificate:
*  subject: CN=*.5wyxi.com
*  start date: Jul 11 00:00:00 2025 GMT
*  expire date: Jul 31 23:59:59 2026 GMT
*  subjectAltName: host "phira.5wyxi.com" matched cert's "*.5wyxi.com"
*  issuer: C=CN; O=WoTrus CA Limited; CN=WoTrus DV Server CA  [Run by the Issuer]
*  SSL certificate verify ok.
*   Certificate level 0: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 1: Public key type RSA (2048/112 Bits/secBits), signed using sha384WithRSAEncryption
*   Certificate level 2: Public key type RSA (4096/152 Bits/secBits), signed using sha384WithRSAEncryption
* using HTTP/1.x
> GET /files/github-showcase.png HTTP/1.1
> Host: phira.5wyxi.com
> User-Agent: curl/8.5.0
> Accept: */*
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< HTTP/1.1 303 See Other
< Server: nginx
< Date: Sun, 08 Feb 2026 17:41:14 GMT
< Content-Length: 0
< Connection: keep-alive
< location: https://phira-cdn.5wyxi.com/github-showcase.png?sign=ac4f5febc097d324d4b4862b60c11399&t=1770572474
< vary: origin, access-control-request-method, access-control-request-headers
< access-control-allow-origin: *
<
* Connection #0 to host phira.5wyxi.com left intact
alan54692@MSI:~/phira$ curl -Lv https://phira.5wyxi.com/files/github-showcase.png
* Host phira.5wyxi.com:443 was resolved.
* IPv6: (none)
* IPv4: 101.35.254.112
*   Trying 101.35.254.112:443...
* Connected to phira.5wyxi.com (101.35.254.112) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: /etc/ssl/certs
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384 / X25519 / RSASSA-PSS
* ALPN: server accepted http/1.1
* Server certificate:
*  subject: CN=*.5wyxi.com
*  start date: Jul 11 00:00:00 2025 GMT
*  expire date: Jul 31 23:59:59 2026 GMT
*  subjectAltName: host "phira.5wyxi.com" matched cert's "*.5wyxi.com"
*  issuer: C=CN; O=WoTrus CA Limited; CN=WoTrus DV Server CA  [Run by the Issuer]
*  SSL certificate verify ok.
*   Certificate level 0: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 1: Public key type RSA (2048/112 Bits/secBits), signed using sha384WithRSAEncryption
*   Certificate level 2: Public key type RSA (4096/152 Bits/secBits), signed using sha384WithRSAEncryption
* using HTTP/1.x
> GET /files/github-showcase.png HTTP/1.1
> Host: phira.5wyxi.com
> User-Agent: curl/8.5.0
> Accept: */*
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< HTTP/1.1 303 See Other
< Server: nginx
< Date: Sun, 08 Feb 2026 17:41:22 GMT
< Content-Length: 0
< Connection: keep-alive
< location: https://phira-cdn.5wyxi.com/github-showcase.png?sign=4c21c5927c091dcc4cefa20f06913ea2&t=1770572482
< vary: origin, access-control-request-method, access-control-request-headers
< access-control-allow-origin: *
<
* Connection #0 to host phira.5wyxi.com left intact
* Issue another request to this URL: 'https://phira-cdn.5wyxi.com/github-showcase.png?sign=4c21c5927c091dcc4cefa20f06913ea2&t=1770572482'
* Host phira-cdn.5wyxi.com:443 was resolved.
* IPv6: (none)
* IPv4: 128.1.102.21
*   Trying 128.1.102.21:443...
* Connected to phira-cdn.5wyxi.com (128.1.102.21) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: /etc/ssl/certs
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256 / X25519 / RSASSA-PSS
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=*.5wyxi.com
*  start date: Jul 11 00:00:00 2025 GMT
*  expire date: Jul 31 23:59:59 2026 GMT
*  subjectAltName: host "phira-cdn.5wyxi.com" matched cert's "*.5wyxi.com"
*  issuer: C=CN; O=WoTrus CA Limited; CN=WoTrus DV Server CA  [Run by the Issuer]
*  SSL certificate verify ok.
*   Certificate level 0: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 1: Public key type RSA (2048/112 Bits/secBits), signed using sha384WithRSAEncryption
*   Certificate level 2: Public key type RSA (4096/152 Bits/secBits), signed using sha384WithRSAEncryption
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://phira-cdn.5wyxi.com/github-showcase.png?sign=4c21c5927c091dcc4cefa20f06913ea2&t=1770572482
* [HTTP/2] [1] [:method: GET]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: phira-cdn.5wyxi.com]
* [HTTP/2] [1] [:path: /github-showcase.png?sign=4c21c5927c091dcc4cefa20f06913ea2&t=1770572482]
* [HTTP/2] [1] [user-agent: curl/8.5.0]
* [HTTP/2] [1] [accept: */*]
> GET /github-showcase.png?sign=4c21c5927c091dcc4cefa20f06913ea2&t=1770572482 HTTP/2
> Host: phira-cdn.5wyxi.com
> User-Agent: curl/8.5.0
> Accept: */*
>
< HTTP/2 200
< content-type: image/png
< date: Sun, 08 Feb 2026 17:41:23 GMT
< etag: "028e24f6968bffeb77a98a0833b66573"
< server: tencent-cos
< x-cos-hash-crc64ecma: 4951967518000076514
< x-cos-request-id: Njk4OGNhYzNfMWM0ZjBmMWVfMjVmNF8xMDliMjBj
< last-modified: Sun, 08 Feb 2026 17:37:43 GMT
< content-length: 881317
< accept-ranges: bytes
< x-nws-log-uuid: 765378629697555668
< x-cache-lookup: Cache Miss
<
Warning: Binary output can mess up your terminal. Use "--output -" to tell
Warning: curl to output it to your terminal anyway, or consider "--output
Warning: <FILE>" to save to a file.
* Failure writing output to destination
* Connection #1 to host phira-cdn.5wyxi.com left intact

If the image camo is down again, please consider to add the image to GitHub repo and direct to it plz test in incognito mode or Ctrl-F5 to refresh the cache

Outdated Screenshot

Also, the screenshot is not latest. But the UI is similar, so it's okay to keep it.