feat(eosdash): add a setup assistant for the basic configuration

New users have to find the settings EOS needs among all configuration values
on the Config page, without a hint which ones matter or what is still missing.

The new Setup page takes the user through the configuration step by step.
Each step explains a few settings, gives an example, reports what is still to
do and shows the configuration cards of exactly these settings. The cards are
the ones of the Config page; the code that creates a card and sends an update
moved out of Configuration() into config_card() and config_update().

The assistant keeps no state: the step travels with the requests and the
status is derived from the EOS configuration, which is read and written
through the EOS server only.

First steps: location, horizons and energy management, save the configuration.

Signed-off-by: SchaafAlexander <86607129+SchaafAlexander@users.noreply.github.com>
Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
Assisted-by: Claude Code (claude-fable-5-2)

CHANGELOG.md

@@ -63,6 +63,9 @@ compatibility changes and a short test procedure. These changes are not yet a ta
   at most two worker processes, one CPU core and a container CPU limit stay free; `1` = one
   process as before) and `optimization.genetic.pin_workers` (workers pinned to the last
   cores, default on). For a fixed seed the plan is identical to a single-process run.
+- EOSdash setup assistant: the new **Setup** page explains the basic settings step by step,
+  gives examples, reports what is still missing and shows the configuration cards of the
+  current step. First steps: location, horizons and energy management, save the configuration.
 
 ### Changed / compatibility