Add CM1 and CM2 boards, six backdrops and a quit button (0.8.0)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

data/curriculum/cm1_homophones.json

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+{
+  "level": "CM1",
+  "region_id": "chateau_des_homophones",
+  "chapter_id": "homophones_cm1",
+  "title": "Les homophones",
+  "region_title": "Le château des homophones",
+  "order": 1,
+  "backdrop": "castle",
+  "rule_ids": [
+    "regle_leur_leurs",
+    "regle_ces_ses",
+    "regle_c_est_s_est"
+  ],
+  "review_status": "draft"
+}

data/curriculum/cm1_orthographe.json

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+{
+  "level": "CM1",
+  "region_id": "jungle_des_mots",
+  "chapter_id": "orthographe_cm1",
+  "title": "L'orthographe des mots",
+  "region_title": "La jungle des mots",
+  "order": 3,
+  "backdrop": "jungle",
+  "rule_ids": [
+    "regle_pluriel_aux_eaux",
+    "regle_ou_ou_accent",
+    "regle_la_la_accent_l_a"
+  ],
+  "review_status": "draft"
+}

data/curriculum/cm1_verbes.json

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+{
+  "level": "CM1",
+  "region_id": "village_des_verbes",
+  "chapter_id": "verbes_cm1",
+  "title": "Les verbes : temps du passé",
+  "region_title": "Le village des verbes",
+  "order": 2,
+  "backdrop": "village",
+  "rule_ids": [
+    "regle_imparfait",
+    "regle_participe_passe_forme",
+    "regle_accord_participe_etre"
+  ],
+  "review_status": "draft"
+}

data/curriculum/cm2_homophones.json

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+{
+  "level": "CM2",
+  "region_id": "station_des_homophones",
+  "chapter_id": "homophones_cm2",
+  "title": "Les homophones",
+  "region_title": "La station des homophones",
+  "order": 1,
+  "backdrop": "space",
+  "rule_ids": [
+    "regle_quel_qu_elle",
+    "regle_quand_quant_qu_en",
+    "regle_plutot_plus_tot"
+  ],
+  "review_status": "draft"
+}

data/curriculum/cm2_orthographe.json

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+{
+  "level": "CM2",
+  "region_id": "bibliotheque_des_mots",
+  "chapter_id": "orthographe_cm2",
+  "title": "L'orthographe des mots",
+  "region_title": "La bibliothèque des mots",
+  "order": 3,
+  "backdrop": "library",
+  "rule_ids": [
+    "regle_adverbes_ment",
+    "regle_tion_sion_ssion",
+    "regle_adjectifs_couleur"
+  ],
+  "review_status": "draft"
+}

data/curriculum/cm2_verbes.json

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+{
+  "level": "CM2",
+  "region_id": "volcan_des_verbes",
+  "chapter_id": "verbes_cm2",
+  "title": "Les verbes : temps et accords",
+  "region_title": "Le volcan des verbes",
+  "order": 2,
+  "backdrop": "volcano",
+  "rule_ids": [
+    "regle_futur_conditionnel",
+    "regle_passe_simple",
+    "regle_participe_cod_avant"
+  ],
+  "review_status": "draft"
+}