Docs: Add PlantUML diagram for custom mining system architecture and SQLite schema

docs/mining_model.puml

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+@startuml mining_model
+!theme plain
+skinparam roundcorner 10
+skinparam shadowing false
+skinparam classAttributeIconSize 0
+skinparam linetype ortho
+
+title Système de Minage Personnalisé (GamingCore) - Modèle de Données & Architecture
+
+package "Database Schema (SQLite / MySQL)" <<Database>> {
+    entity "ores" as OresTable {
+        * id : VARCHAR(64) <<PK>>
+        --
+        * block_material : VARCHAR(64)
+        * hardness : DOUBLE
+        * rarity : VARCHAR(32)
+        * stock : INTEGER
+        * respawnable : BOOLEAN
+        * respawn_time : INTEGER
+        * temp_block : VARCHAR(64)
+        created_at : TIMESTAMP
+    }
+
+    entity "ore_drops" as OreDropsTable {
+        * id : INTEGER <<PK, AUTOINCREMENT>>
+        --
+        * ore_id : VARCHAR(64) <<FK>>
+        * item_material : VARCHAR(64)
+        * default_amount : INTEGER
+        * default_chance : DOUBLE
+        * fortunable : BOOLEAN
+        * fortune_multiplier : DOUBLE
+        * smeltable : BOOLEAN
+        smelted_material : VARCHAR(64)
+    }
+
+    entity "placed_ores" as PlacedOresTable {
+        * id : INTEGER <<PK, AUTOINCREMENT>>
+        --
+        * ore_id : VARCHAR(64) <<FK>>
+        * world : VARCHAR(64)
+        * x : INTEGER
+        * y : INTEGER
+        * z : INTEGER
+        * current_stock : INTEGER
+        * is_depleted : BOOLEAN
+        * next_respawn_at : BIGINT
+    }
+
+    OresTable ||..o{ OreDropsTable : "1:N (Drops configurés)"
+    OresTable ||..o{ PlacedOresTable : "1:N (Blocs actifs dans le monde)"
+}
+
+package "fr.luc.gamingcore.mining.model" {
+    class CustomOre {
+        - id: String
+        - blockMaterial: XMaterial
+        - hardness: double
+        - rarity: OreRarity
+        - stock: int
+        - respawnable: boolean
+        - respawnTimeSeconds: int
+        - tempBlockMaterial: XMaterial
+        - drops: List<OreDrop>
+        + isDepleted(currentStock: int): boolean
+    }
+
+    class OreDrop {
+        - id: int
+        - itemMaterial: XMaterial
+        - defaultAmount: int
+        - defaultChance: double
+        - fortunable: boolean
+        - fortuneMultiplier: double
+        - smeltable: boolean
+        - smeltedMaterial: XMaterial
+        + calculateDrop(fortuneLevel: int, hasSmeltEnchant: boolean): ItemStack
+    }
+
+    class PlacedOreBlock {
+        - id: int
+        - oreType: CustomOre
+        - worldName: String
+        - x: int
+        - y: int
+        - z: int
+        - currentStock: int
+        - depleted: boolean
+        - nextRespawnTimestamp: long
+        + mine(player: Player): List<ItemStack>
+        + triggerRespawn(): void
+    }
+
+    enum OreRarity {
+        COMMON
+        UNCOMMON
+        RARE
+        EPIC
+        LEGENDARY
+        MYTHIC
+    }
+}
+
+package "fr.luc.gamingcore.mining.manager" {
+    class OreManager {
+        - ores: Map<String, CustomOre>
+        - placedBlocks: Map<BlockLocation, PlacedOreBlock>
+        + registerOre(ore: CustomOre): void
+        + getOre(id: String): CustomOre
+        + getPlacedBlock(location: Location): PlacedOreBlock
+        + placeOreBlock(oreId: String, location: Location): PlacedOreBlock
+        + removeOreBlock(location: Location): void
+    }
+
+    class RespawnScheduler {
+        + startTask(): void
+        + checkRespawnQueue(): void
+    }
+
+    class DatabaseManager {
+        - connectionSource: Connection
+        + initTables(): void
+        + loadAllOres(): List<CustomOre>
+        + loadPlacedBlocks(): List<PlacedOreBlock>
+        + savePlacedBlock(block: PlacedOreBlock): void
+        + updatePlacedBlockState(block: PlacedOreBlock): void
+        + deletePlacedBlock(id: int): void
+    }
+}
+
+package "fr.luc.gamingcore.mining.listener" {
+    class BlockBreakListener {
+        + onBlockBreak(event: BlockBreakEvent): void
+    }
+    class BlockPlaceListener {
+        + onBlockPlace(event: BlockPlaceEvent): void
+    }
+}
+
+CustomOre "1" *-- "many" OreDrop
+CustomOre "1" -- "many" PlacedOreBlock
+CustomOre --> OreRarity
+
+OreManager o-- CustomOre
+OreManager o-- PlacedOreBlock
+OreManager --> DatabaseManager
+OreManager --> RespawnScheduler
+
+BlockBreakListener --> OreManager
+BlockPlaceListener --> OreManager
+
+@enduml