Switch Maslow CNC web interface from HTTP to HTTPS

[Copilot]

Replaces the HTTP web server with HTTPS using self-signed certificates to encrypt all web traffic to the Maslow CNC controller.

Changes

SSL/TLS Implementation

• Added esp32_https_server_compat library dependency from GitHub master
• Generated embedded 10-year RSA 2048-bit self-signed certificates in DER format
• Created SSLCert.h with certificate and private key arrays

Web Server Migration

• Replaced WebServer with ESPWebServerSecure throughout
• Changed default port from 80 to 443
• Refactored file streaming from client().write() to streamFile() API
• Updated WebClient to use ESPWebServer base class for compatibility

Service Announcements

• Updated mDNS service type: "http" → "https"
• Changed SSDP and redirect URLs from http:// to https://

Library Compatibility

• Patched esp32_https_server dependency: hwcrypto/sha.h → sha/sha_parallel_engine.h for ESP-IDF v4.4+ compatibility

Example

Connecting to the machine now requires HTTPS:

// Before
_webserver = new WebServer(_port);  // Port 80
MDNS.addService("http", "tcp", _port);

// After  
_webserver = new ESPWebServerSecure(_port);  // Port 443
_webserver->setServerKeyAndCert(private_key_der, private_key_der_len, 
                                 certificate_der, certificate_der_len);
MDNS.addService("https", "tcp", _port);

Browsers will show security warnings for the self-signed certificate, which users must accept. All traffic is now encrypted via TLS.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Switch from http to https</issue_title>
<issue_description>Switch from using http to using https for connecting to the machine.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Switch from http to https #573

---

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[davidelang]

@MaslowBot add a button to download the self-signed CA into the browser in the settings popup. include instructions (or links to instructions) for major browsers, including mobile devices.

[MaslowBot]

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

@MaslowBot add a button to download the self-signed CA into the browser in the settings popup. include instructions (or links to instructions) for major browsers, including mobile devices.

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

This comment was automatically relayed by MaslowBot so that @copilot-swe-agent can respond to the request.

[davidelang]

@MaslowBot allow both http and https access.

[MaslowBot]

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

@MaslowBot allow both http and https access.

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

This comment was automatically relayed by MaslowBot so that @copilot-swe-agent can respond to the request.

[BarbourSmith]

@davidelang please don't make changes to my pull requests

[davidelang]

BarbourSmith wrote:

BarbourSmith left a comment (MaslowCNC/Maslow_4#574) @davidelang please don't make changes to my pull requests

Ok, I'll just send the comments to you instead of the bot. David Lang

[Copilot]

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:...

The PR author (@BarbourSmith) has requested that no changes be made to this pull request. If you'd like to support both HTTP and HTTPS simultaneously, please consider opening a separate issue or PR for that feature.

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:...

The PR author (@BarbourSmith) has requested that no changes be made to this pull request. If you'd like this feature, please consider opening a separate issue or PR for adding a certificate download button with browser installation instructions.

[davidelang]

@BarbourSmith I don't think the maslow has a battery backed real time clock to give it the date/time after a power cycle, if it's in AP mode (no Internet connection) how does it get the time to do certificate validation?