feat(vm): Medien pro VM (disk/floppy/iso) + ARIA-Urteilswissen

vm_register + Registry + boot fassen jetzt das ECHTE Boot-Medium (disk/floppy/
iso) — Eintrag, Startbefehl und App-Start spiegeln die reale Config. Leer =
aria-vm erkennt disk.qcow2/floppy.img/cdrom.iso selbst.
- project_vms.add_vm: floppy/disk-Felder.
- main.py: VmAddBody + _vm_boot_args (baut --disk/--floppy/--iso), boot-Endpoint
  + boot_cmd nutzen sie.
- agent.py: vm_register-Tool bekommt disk/floppy/iso.
- Seed-Regel: URTEIL — VM nur wenn sinnvoll; Medium aus der Situation (Festplatte
  fuer DOS-Spiele, Diskette fuer OS-Dev, ISO fuer Installer); Architektur zum Task
  (ARM=aarch64, emuliert/langsam ok); Aenderungs-Zyklus stop→aendern→boot.

py_compile clean. aria-vm schon live auf dem Host.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

aria-brain/main.py

@@ -961,20 +961,30 @@ class VmAddBody(BaseModel):
     name: str
     arch: str = "i386"
     iso: str = ""
+    floppy: str = ""
+    disk: str = ""
     vnc_display: int = 1
     mem: int = 1024
     create_disk: bool = False
     size: str = "10G"
 
 
+def _vm_boot_args(v: dict) -> list:
+    args = ["boot", v.get("name", "?"),
+            "--vnc-display", str(v.get("vnc_display", 1)),
+            "--mem", str(v.get("mem", 1024))]
+    if v.get("disk"):
+        args += ["--disk", v["disk"]]
+    if v.get("floppy"):
+        args += ["--floppy", v["floppy"]]
+    if v.get("iso"):
+        args += ["--iso", v["iso"]]
+    return args
+
+
 def _vm_boot_cmd(v: dict) -> str:
     """Lesbarer Start-Befehl (aria-vm) als 'Wert' hinter dem VM-Eintrag."""
-    parts = ["aria-vm", "boot", v.get("name", "?"),
-             "--vnc-display", str(v.get("vnc_display", 1)),
-             "--mem", str(v.get("mem", 1024))]
-    if v.get("iso"):
-        parts += ["--iso", v["iso"]]
-    return " ".join(parts)
+    return "aria-vm " + " ".join(_vm_boot_args(v))
 
 
 @app.get("/projects/{project_id}/vms")
@@ -992,7 +1002,7 @@ def project_vms_list(project_id: str):
 def project_vm_add(project_id: str, body: VmAddBody):
     try:
         vm = project_vms_mod.add_vm(project_id, body.name, body.arch, body.iso,
-                                    body.vnc_display, body.mem)
+                                    body.floppy, body.disk, body.vnc_display, body.mem)
     except ValueError as exc:
         raise HTTPException(status_code=400, detail=str(exc))
     if body.create_disk:
@@ -1017,11 +1027,7 @@ def project_vm_boot(project_id: str, name: str):
     vm = project_vms_mod.get_vm(project_id, name)
     if not vm:
         raise HTTPException(status_code=404, detail=f"VM '{name}' nicht gefunden")
-    args = ["boot", name, "--vnc-display", str(vm.get("vnc_display", 1)),
-            "--mem", str(vm.get("mem", 1024))]
-    if vm.get("iso"):
-        args += ["--iso", vm["iso"]]
-    rc, out, err = _ssh_aria_vm(*args, timeout=40)
+    rc, out, err = _ssh_aria_vm(*_vm_boot_args(vm), timeout=40)
     return {"ok": rc == 0, "name": name, "vnc_port": 5900 + int(vm.get("vnc_display", 1)),
             "output": (out.strip() or err.strip())[:500]}