feat!: remove the old API, ports 8081 and 8080 (step 4a)

Step 4a of docs/SECURITY_PLAN.md. Port 80 keeps the eleven HTTP routes of
ADR 0006 and the socket at /ws; everything else moved to protocol 2.

- Port 8081 (ApiRoutes) and the socket on 8080 (SocketEmitter) are gone.
  Protocol 2 owns its frame buffer and loop-task check.
- Port 80 drops every route the old web UI called: reads, edits,
  settings, scans, reboot, /shades.cfg, /discovery. HttpRoutes.cpp holds
  what stays.
- ModelSnapshot, SnapshotSlots and the read documents are gone. The item
  snapshot types stay, as ItemSnapshot, for events, MQTT and the command
  replies.
- Model edits reply only to their protocol 2 op: requestResult goes.
- The settings' toJSON writers, used only by the settings routes, go.
- The _espsomfy_rts._tcp mDNS record moves to port 80, with path=/ws.
- The memory event reports the loop-rate window it closes.
- A deleted room no longer re-publishes its retained MQTT topics.
- e2e: the heap check reads the sync's status; the sync is checked on
  its own instead of against /controller.
- README gets an API and ports section.

BREAKING CHANGE: ports 8081 and 8080 and the old HTTP routes are gone.
Home Assistant needs integration 3.0.0 or newer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/entryPoints/WebRoutes.h

@@ -1,17 +1,13 @@
 #ifndef WEB_ROUTES_H
 #define WEB_ROUTES_H
 #include <ESPAsyncWebServer.h>
-#include "Somfy.h"
 #include "LoopQueue.h"
-#include "ModelSnapshot.h"
 
-// What WebUiRoutes, ApiRoutes and the handlers both of them call (Web.cpp)
-// share.  Internal to the web servers.
+// What HttpRoutes and the handlers it calls (Web.cpp) share.  Internal to the
+// web server.
 
-// Registers the routes the config web UI calls on port 80, and its files.
-void registerWebUiRoutes(AsyncWebServer &server);
-// Registers the routes integrations such as Home Assistant call on port 8081.
-void registerApiRoutes(AsyncWebServer &server);
+// Registers the HTTP routes on port 80, and the web UI's files.
+void registerHttpRoutes(AsyncWebServer &server);
 
 #define WEB_MAX_RESPONSE 4096
 // Where replies are formatted before they are sent.  async_tcp only.
@@ -19,26 +15,10 @@ extern char g_async_content[WEB_MAX_RESPONSE];
 extern const char _encoding_text[];
 extern const char _encoding_json[];
 
-// Sent when a request can't be handed to loop().
-void sendQueueFull(AsyncWebServerRequest *request);
-// Sent when the radio can't take a frame (suspended or queue full).
-void sendRadioUnavailable(AsyncWebServerRequest *request);
 // Hands an item to loop(), which owns the shades.  When it can't be the
 // request is answered with the reason and false is returned.
 bool queueLoopItem(AsyncWebServerRequest *request, const loop_item_t &item);
-bool queueShadeRequest(AsyncWebServerRequest *request, const shade_request_t &req);
 // A query parameter, or an empty string when it is missing.
 String asyncParam(AsyncWebServerRequest *request, const char *name);
 bool asyncHasParam(AsyncWebServerRequest *request, const char *name);
-// Serves a read from a ModelSnapshot that loop() fills.
-void sendSnapshot(AsyncWebServerRequest *request, snapshot_doc_t doc, uint8_t id = 0, snapshot_header_t header = nullptr);
-
-// One item of a reply, copied from the live shade model.
-void serializeShadeRef(SomfyShade *shade, JsonFormatter &json);
-void serializeShade(SomfyShade *shade, JsonFormatter &json);
-void serializeShade(SomfyShade *shade, JsonFormatter &json, bool paired, uint16_t lastRollingCode);
-void serializeTransceiverConfig(JsonFormatter &json);
-void serializeAppVersion(JsonFormatter &json, appver_t &ver);
-// The installed firmware and web application versions.
-void serializeVersion(JsonFormatter &json);
 #endif