Merge remote-tracking branch 'origin/remove-osd' into integration_2026_w13 (!4004)

Remove OSD, some scripts, oaisim references

The README says:
  It is just generating the XML file and it is placing it in
  $(OPENAIR_TARGETS)/SIMU/EXAMPLE/OSD/WEBXML/ or http://localhost/xmlfile/
  so that the oaisim could pars and run the simulation/emulation

oaisim does not exist anymore, and corresponding simulation cannot be done.
Also, it requires XAMPP and similar technologies, that I think nobody uses
in the context of OAI.
Remove also most references to oaisim.
Remove some scripts that are likely not used by anybody, or straight useless.

doc/L1SIM.md

@@ -4,12 +4,8 @@
 Rather, you are probably looking for the
 [RFsimulator](../radio/rfsimulator/README.md)!**
 
-oaisim has been scraped and replaced by the same programs that are used for the
-real-time operation, `lte-softmodem` and `lte-uesoftmodem`. This uses the IF4p5
-fronthaul protocol to achieve the communication.
-
-> Context: oaisim used to be a simulation mode inside OAI to emulate an eNB and
-multiple UEs.
+`lte-softmodem` and `lte-uesoftmodem` can use the IF4p5 fronthaul protocol to
+communicate with each other.
 
 [[_TOC_]]
 
@@ -50,7 +46,7 @@ $ cd ../ran_build/build
 $ sudo ./lte-uesoftmodem -O XXX.conf -r 25 --siml1 --noS1
 ```
 
-That should give you equivalent functionality to what you had with oaisim including noise and RF channel emulation (path loss / fading, etc.). You should also be able to run multiple UEs. 
+That should give you functionality to do noise and RF channel emulation (path loss / fading, etc.). You should also be able to run multiple UEs.
 
 ## How to ping an eNB from a UE and vice versa (with the noS1 option)