feat(rag): écran admin d'ingestion du corpus (provider /rag + réindexation live)

Gestion du corpus RAG depuis l'app admin, sans adb.

Patient :
- RagDb v2 : table rag_docs (documents BRUTS, source de vérité) séparée des
  embeddings rag_chunks ; onUpgrade ajoute la table.
- Rag : ingest enregistre le doc brut ; reingestMissing() (ré)indexe les docs
  sans embeddings ; listDocs/deleteDoc.
- ContentProvider /rag : query liste (source+char+chunk_count), /rag/<src> texte
  pour édition, insert (upsert doc + invalide chunks + broadcast), delete /rag/<src>.
  Broadcast RELOAD_RAG EXPLICITE (setPackage) — l'implicite n'est pas délivré au
  receiver NOT_EXPORTED sur Android récent.
- KazeiaService : receiver RAG_RELOAD -> reingestMissing live ; au démarrage,
  embarque les docs ajoutés hors-ligne.

Admin : KazeiaRagClient + RagRepository + RagScreen (Compose : liste, badge
"à indexer", ajout/édition/suppression). Remplace le StubScreen du slot Rag.

Validé device E2E : admin insert 'colere' -> RELOAD -> embeddé live (chunk_count 1,
sans restart) -> tour patient "fou de rage" récupère [Source: colere] (top 0.83)
-> réponse ancrée. App admin se lance sans crash.

Au passage : .gitignore exclut kazeia-android/*/build/ et dé-suit app-admin/build/
(1017 artefacts qui étaient trackés par erreur).

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

.gitignore

@@ -35,6 +35,7 @@
 *.pyc
 __pycache__/
 kazeia-android/app/build/
+kazeia-android/*/build/
 kazeia-android/build/
 kazeia-android/.gradle/
 kazeia-android/local.properties

kazeia-android/app-admin/build/generated/source/buildConfig/debug/com/kazeia/admin/BuildConfig.java

@@ -1,12 +0,0 @@
-/**
- * Automatically generated file. DO NOT MODIFY
- */
-package com.kazeia.admin;
-
-public final class BuildConfig {
-  public static final boolean DEBUG = Boolean.parseBoolean("true");
-  public static final String APPLICATION_ID = "com.kazeia.admin";
-  public static final String BUILD_TYPE = "debug";
-  public static final int VERSION_CODE = 1;
-  public static final String VERSION_NAME = "0.1.0-mvp";
-}

kazeia-android/app-admin/build/intermediates/annotation_processor_list/debug/javaPreCompileDebug/annotationProcessors.json

@@ -1 +0,0 @@
-{}

kazeia-android/app-admin/build/intermediates/apk_ide_redirect_file/debug/createDebugApkListingFileRedirect/redirect.txt

@@ -1,2 +0,0 @@
-#- File Locator -
-listingFile=../../../../outputs/apk/debug/output-metadata.json

kazeia-android/app-admin/build/intermediates/app_metadata/debug/writeDebugAppMetadata/app-metadata.properties

@@ -1,2 +0,0 @@
-appMetadataVersion=1.1
-androidGradlePluginVersion=8.7.3

kazeia-android/app-admin/build/intermediates/compatible_screen_manifest/debug/createDebugCompatibleScreenManifests/output-metadata.json

@@ -1,10 +0,0 @@
-{
-  "version": 3,
-  "artifactType": {
-    "type": "COMPATIBLE_SCREEN_MANIFEST",
-    "kind": "Directory"
-  },
-  "applicationId": "com.kazeia.admin",
-  "variantName": "debug",
-  "elements": []
-}

kazeia-android/app-admin/build/intermediates/dex_number_of_buckets_file/debug/dexBuilderDebug/out

@@ -1 +0,0 @@
-8