feat(user): add certificate production tracking and update localization

- Introduced a new field `certificateProductionsCountSince` in the `FalukantUser` model to track the date from which production logs are counted for certificate requirements.
- Updated the `FalukantService` to utilize the new field for calculating completed productions since the specified date.
- Enhanced the UI to display the count of productions since the last promotion, with corresponding translations added for multiple languages including Cebuano, German, English, Spanish, and French.
- Implemented a method to delete old production logs, ensuring efficient data management while maintaining necessary historical records for certificate calculations.

frontend/scripts/ceb-patches/falukant-patch.json

@@ -2,6 +2,7 @@
   "falukant": {
     "overview": {
       "certificate": {
+        "productionsSince": "Mga produksyon sugod sa {date} ra ang ihap (sukad sa katapusang pag-asenso, bangkaruta, o panununod).",
         "factor": {
           "avgKnowledge": "Average kahibalo",
           "completedProductions": "Nahuman produksyons",

frontend/src/i18n/locales/ceb/falukant.json

@@ -158,6 +158,7 @@
                 },
                 "factors": "Karon nga mga bili",
                 "requirements": "Mga kinahanglanon sa sunod nga level",
+                "productionsSince": "Mga produksyon sugod sa {date} ra ang ihap (sukad sa katapusang pag-asenso, bangkaruta, o panununod).",
                 "factor": {
                     "avgKnowledge": "Average kahibalo",
                     "completedProductions": "Nahuman produksyons",

frontend/src/i18n/locales/de/falukant.json

@@ -178,6 +178,7 @@
                 },
                 "factors": "Aktuelle Werte",
                 "requirements": "Bedingungen für die nächste Stufe",
+                "productionsSince": "Nur Produktionen ab {date} zählen (seit letztem Aufstieg, Bankrott oder Erbfolge).",
                 "factor": {
                     "avgKnowledge": "Durchschnittliches Wissen",
                     "completedProductions": "Abgeschlossene Produktionen",

frontend/src/i18n/locales/en/falukant.json

@@ -159,6 +159,7 @@
                 },
                 "factors": "Current values",
                 "requirements": "Requirements for the next level",
+                "productionsSince": "Only productions on or after {date} count (since last promotion, bankruptcy, or succession).",
                 "factor": {
                     "avgKnowledge": "Average knowledge",
                     "completedProductions": "Completed productions",

frontend/src/i18n/locales/es/falukant.json

@@ -177,6 +177,7 @@
                 },
                 "factors": "Valores actuales",
                 "requirements": "Condiciones para el siguiente nivel",
+                "productionsSince": "Solo cuentan producciones desde el {date} (desde el último ascenso, quiebra o sucesión).",
                 "factor": {
                     "avgKnowledge": "Conocimiento medio",
                     "completedProductions": "Producciones completadas",

frontend/src/i18n/locales/fr/falukant.json

@@ -177,6 +177,7 @@
                 },
                 "factors": "Valeurs actuelles",
                 "requirements": "Conditions pour la prochaine étape",
+                "productionsSince": "Seules les productions à partir du {date} comptent (depuis la dernière promotion, faillite ou succession).",
                 "factor": {
                     "avgKnowledge": "Connaissance moyenne",
                     "completedProductions": "Productions terminées",

frontend/src/views/falukant/OverviewView.vue

@@ -131,6 +131,16 @@
                         <div class="detail-list__item">
                             <span>{{ $t('falukant.overview.certificate.factor.completedProductions') }}</span>
                             <strong>{{ certificateProgress.currentValues.completedProductions }}</strong>
+                            <p
+                                v-if="certificateProgress.certificateProductionsCountSince"
+                                class="certificate-panel__productions-since"
+                            >
+                                {{
+                                    $t('falukant.overview.certificate.productionsSince', {
+                                        date: formatDate(certificateProgress.certificateProductionsCountSince),
+                                    })
+                                }}
+                            </p>
                         </div>
                         <div class="detail-list__item">
                             <span>{{ $t('falukant.overview.certificate.factor.reputation') }}</span>
@@ -907,6 +917,13 @@ export default {
     color: var(--color-text-secondary);
 }
 
+.certificate-panel__productions-since {
+    margin: 6px 0 0;
+    font-size: 0.85rem;
+    line-height: 1.35;
+    color: var(--color-text-secondary);
+}
+
 .certificate-panel__grid {
     display: grid;
     grid-template-columns: repeat(2, minmax(0, 1fr));