feat(i18n): GLP-1 drug knowledge labels across 6 locales

Add medications.glp1.drug.* namespace with localized INN + drug-class
labels for tirzepatide, semaglutide, liraglutide, dulaglutide, and
exenatide, plus medications.glp1.source.{ema,psp4} citation strings.

Each locale uses the regional spelling convention (DE Tirzepatid,
ES Tirzepatida, PL Tyrzepatyd, …) — scientific names are written
naturally for each market rather than transliterated. Drug-class
labels follow the local pharmacology vocabulary.

All 6 locale files validate; i18n-locale-integrity green.

messages/de.json

@@ -651,7 +651,35 @@
     "labelPlaceholder": "z.B. Morgens",
     "defaultDose": "Standard",
     "dayDeactivate": "{day} deaktivieren",
-    "dayActivate": "{day} aktivieren"
+    "dayActivate": "{day} aktivieren",
+    "glp1": {
+      "drug": {
+        "tirzepatide": {
+          "name": "Tirzepatid",
+          "class": "GIP-GLP-1-Doppel-Agonist"
+        },
+        "semaglutide": {
+          "name": "Semaglutid",
+          "class": "GLP-1-Rezeptoragonist"
+        },
+        "liraglutide": {
+          "name": "Liraglutid",
+          "class": "GLP-1-Rezeptoragonist"
+        },
+        "dulaglutide": {
+          "name": "Dulaglutid",
+          "class": "GLP-1-Rezeptoragonist"
+        },
+        "exenatide": {
+          "name": "Exenatid",
+          "class": "GLP-1-Rezeptoragonist"
+        }
+      },
+      "source": {
+        "ema": "EMA-Quelle",
+        "psp4": "Peer-Reviewed Pharmakometrik"
+      }
+    }
   },
   "charts": {
     "title": "Verlauf",

messages/en.json

@@ -651,7 +651,35 @@
     "labelPlaceholder": "e.g. Morning",
     "defaultDose": "Default",
     "dayDeactivate": "Deactivate {day}",
-    "dayActivate": "Activate {day}"
+    "dayActivate": "Activate {day}",
+    "glp1": {
+      "drug": {
+        "tirzepatide": {
+          "name": "Tirzepatide",
+          "class": "GIP-GLP-1 dual agonist"
+        },
+        "semaglutide": {
+          "name": "Semaglutide",
+          "class": "GLP-1 receptor agonist"
+        },
+        "liraglutide": {
+          "name": "Liraglutide",
+          "class": "GLP-1 receptor agonist"
+        },
+        "dulaglutide": {
+          "name": "Dulaglutide",
+          "class": "GLP-1 receptor agonist"
+        },
+        "exenatide": {
+          "name": "Exenatide",
+          "class": "GLP-1 receptor agonist"
+        }
+      },
+      "source": {
+        "ema": "EMA source",
+        "psp4": "Peer-reviewed pharmacometrics"
+      }
+    }
   },
   "charts": {
     "title": "History",

messages/es.json

@@ -651,7 +651,35 @@
     "labelPlaceholder": "e.g. Morning",
     "defaultDose": "Default",
     "dayDeactivate": "Deactivate {day}",
-    "dayActivate": "Activate {day}"
+    "dayActivate": "Activate {day}",
+    "glp1": {
+      "drug": {
+        "tirzepatide": {
+          "name": "Tirzepatida",
+          "class": "Agonista dual GIP-GLP-1"
+        },
+        "semaglutide": {
+          "name": "Semaglutida",
+          "class": "Agonista del receptor GLP-1"
+        },
+        "liraglutide": {
+          "name": "Liraglutida",
+          "class": "Agonista del receptor GLP-1"
+        },
+        "dulaglutide": {
+          "name": "Dulaglutida",
+          "class": "Agonista del receptor GLP-1"
+        },
+        "exenatide": {
+          "name": "Exenatida",
+          "class": "Agonista del receptor GLP-1"
+        }
+      },
+      "source": {
+        "ema": "Fuente EMA",
+        "psp4": "Farmacometría revisada por pares"
+      }
+    }
   },
   "charts": {
     "title": "Historial",

messages/fr.json

@@ -651,7 +651,35 @@
     "labelPlaceholder": "e.g. Morning",
     "defaultDose": "Default",
     "dayDeactivate": "Deactivate {day}",
-    "dayActivate": "Activate {day}"
+    "dayActivate": "Activate {day}",
+    "glp1": {
+      "drug": {
+        "tirzepatide": {
+          "name": "Tirzépatide",
+          "class": "Agoniste double GIP-GLP-1"
+        },
+        "semaglutide": {
+          "name": "Sémaglutide",
+          "class": "Agoniste du récepteur GLP-1"
+        },
+        "liraglutide": {
+          "name": "Liraglutide",
+          "class": "Agoniste du récepteur GLP-1"
+        },
+        "dulaglutide": {
+          "name": "Dulaglutide",
+          "class": "Agoniste du récepteur GLP-1"
+        },
+        "exenatide": {
+          "name": "Exénatide",
+          "class": "Agoniste du récepteur GLP-1"
+        }
+      },
+      "source": {
+        "ema": "Source EMA",
+        "psp4": "Pharmacométrie évaluée par les pairs"
+      }
+    }
   },
   "charts": {
     "title": "Historique",

messages/it.json

@@ -651,7 +651,35 @@
     "labelPlaceholder": "e.g. Morning",
     "defaultDose": "Default",
     "dayDeactivate": "Deactivate {day}",
-    "dayActivate": "Activate {day}"
+    "dayActivate": "Activate {day}",
+    "glp1": {
+      "drug": {
+        "tirzepatide": {
+          "name": "Tirzepatide",
+          "class": "Agonista duale GIP-GLP-1"
+        },
+        "semaglutide": {
+          "name": "Semaglutide",
+          "class": "Agonista del recettore GLP-1"
+        },
+        "liraglutide": {
+          "name": "Liraglutide",
+          "class": "Agonista del recettore GLP-1"
+        },
+        "dulaglutide": {
+          "name": "Dulaglutide",
+          "class": "Agonista del recettore GLP-1"
+        },
+        "exenatide": {
+          "name": "Exenatide",
+          "class": "Agonista del recettore GLP-1"
+        }
+      },
+      "source": {
+        "ema": "Fonte EMA",
+        "psp4": "Farmacometria peer-reviewed"
+      }
+    }
   },
   "charts": {
     "title": "Cronologia",

messages/pl.json

@@ -651,7 +651,35 @@
     "labelPlaceholder": "e.g. Morning",
     "defaultDose": "Default",
     "dayDeactivate": "Deactivate {day}",
-    "dayActivate": "Activate {day}"
+    "dayActivate": "Activate {day}",
+    "glp1": {
+      "drug": {
+        "tirzepatide": {
+          "name": "Tyrzepatyd",
+          "class": "Podwójny agonista GIP-GLP-1"
+        },
+        "semaglutide": {
+          "name": "Semaglutyd",
+          "class": "Agonista receptora GLP-1"
+        },
+        "liraglutide": {
+          "name": "Liraglutyd",
+          "class": "Agonista receptora GLP-1"
+        },
+        "dulaglutide": {
+          "name": "Dulaglutyd",
+          "class": "Agonista receptora GLP-1"
+        },
+        "exenatide": {
+          "name": "Eksenatyd",
+          "class": "Agonista receptora GLP-1"
+        }
+      },
+      "source": {
+        "ema": "Źródło EMA",
+        "psp4": "Farmakometria recenzowana"
+      }
+    }
   },
   "charts": {
     "title": "Historia",