feat: Auto-init nvs in wifi if wifi nvs storage enabled in config

[finger563]

Description

• Update wifi component to initialize nvs subsystem if wifi storage into nvs is configured in menuconfig
• Update docs to remove note about manual init, since it's automatic now
• Update example to remove explicit nvs init code

Motivation and Context

Simplifies wifi usage and cleans up boilerplate code some.

How has this been tested?

Build and run wifi example on esp32

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Hardware (schematic, board, system design) change
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI

Software

• I have added tests to cover my changes.
• I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
• All new and existing tests passed.
• My code follows the code style of this project.

[github-actions]

✅Static analysis result - no issues found! ✅

[Copilot]

Pull request overview

This PR updates the wifi component to automatically initialize NVS when WiFi NVS storage is enabled, aiming to remove the need for callers/examples to explicitly initialize NVS before using WiFi.

Changes:

• Auto-initialize NVS from the espp::Wifi singleton constructor when CONFIG_ESP32_WIFI_NVS_ENABLED is set.
• Add an espp::Nvs member to Wifi to perform the initialization.
• Update the wifi component’s CMake REQUIRES dependencies to include the nvs component.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
components/wifi/include/wifi.hpp	Adds conditional NVS include + initializes NVS in Wifi constructor; introduces espp::Nvs member.
components/wifi/CMakeLists.txt	Switches dependency from nvs_flash to the nvs component.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.