feat: Unified ethernet and WiFi network handling with static IP support

[CarlosDerSeher]

This commit consolidates 86 commits of development work implementing:

• Unified ethernet and WiFi network interface management
• Ethernet with static IP configuration support
• WiFi failover when ethernet disconnects
• Ethernet priority with automatic failover to WiFi
• IPv6 support with fallback to IPv4
• Improved network robustness and error handling
• Global restart button for network recovery
• Web UI for ethernet static IP configuration
• Proper cleanup and resource management
• Various bug fixes and stability improvements

Key changes:

• Merged separate ethernet and WiFi components into unified network interface
• Added persistent Ethernet static IP configuration via Kconfig
• Implemented proper connection state management with FreeRTOS EventGroups
• Added gateway reachability checks with IPv6 fallback
• Fixed race conditions in player startup/shutdown
• Improved DHCP restart handling
• Reduced buffer allocation for PSRAM-less devices (750ms -> 700ms)

[CarlosDerSeher]

@craigmillard86 As I feared, We have a lot of conflicts with the parser refactor. I did not merge those changes yet but put it to a seperate branch for now to see how we can integrate ethernet changes there. I saw that we have those confilcts in #195 too...

@blattm maybe you could be of assitence here too

[luar123]

Something is messed up with the commits. There are many unrelated changes. Same in #195.

[craigmillard86]

Something is messed up with the commits. There are many unrelated changes. Same in #195.

yeah you are right, looks like i based on Master for some reason!! I am looking into rebasing to develop

[CarlosDerSeher]

@craigmillard86 Could you possible rebase to refactor parser branch?

[craigmillard-hha]

@craigmillard86 Could you possible rebase to refactor parser branch?

Yep, will rebase to develop first as will reduce complexity then look at merge to refactor parser branch

[blattm]

Yes, doing it in two steps (first develop then refactor-parser) seems like the way to go!

For the second step, I can share the strategy that worked best for me so far:
In case there are huge conflicts, accept the refactor-parser version. Then go through each change in main.c of the new feature (compared to dev), think where it would belong now (main.c, connection_handler, ...), and insert it there manually.

Let me know if you need help! :)

[craigmillard86]

Think i have the first stage complete here: https://github.com/anabolyc/esp32-snapclient/tree/feature/unified-eth-develop
Need to find some time to test unless @CarlosDerSeher are you still setup to test ethernet?

[CarlosDerSeher]

Yes, but today I won't have time. Earliest tomorrow evening

[luar123]

There are still some changes reverting recent commits, for example in sdkconfig and player.c. Probably also in other files but hard to tell.

[CarlosDerSeher]

@craigmillard86 I guess this can be closed too?

[craigmillard86]

@craigmillard86 I guess this can be closed too?

yep no longer needed, please close will open a new one to merge the new branch to the refactor branch