Initial scaffold: Nakama backend, Godot client, content schema

Sets up the Step 1 (Project Foundation) and Step 2 (Content Schemas) scaffold
from the implementation sequence. Includes Docker Compose stack, Nakama
TypeScript module stubs, PostgreSQL migration, Godot 4 project shell with
scene stubs and NakamaClient singleton, YAML content schemas for all entity
types, and example data for 3 characters, 2 jobs, and all 7 core resources.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

content/schema/character.yaml

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+# character.yaml — schema definition for Xyvera character content files
+#
+# Every file under content/data/characters/ must conform to this schema.
+# Run `tools/validate_content.py` to check all data files against schemas.
+#
+# Design notes from spec:
+#   - Rarity: R / SR / SSR / UR (four-tier PoC model; full ladder naming deferred)
+#   - Combat roles: recon, sabotage, healer, support, tank, glass_cannon
+#   - Profession roles: miner, lumberjack, researcher, construction, farmer, trainer
+#   - Male and female presentation variants are art/naming only; mechanics identical
+#   - No duplicate-dependency model: progression uses universal materials, bonds,
+#     and assignment mastery
+
+$schema: "xyvera/content-schema/character/v1"
+
+type: object
+required:
+  - id
+  - name
+  - rarity
+  - combat_role
+  - profession
+  - base_stats
+  - skills
+  - suitability_bonuses
+
+properties:
+
+  id:
+    type: string
+    description: "Unique character identifier. Snake_case. Shared between male/female variants."
+    pattern: "^[a-z][a-z0-9_]*$"
+    example: "lyra_stoneheart"
+
+  name:
+    type: object
+    description: "Display names for each presentation variant."
+    required: [female]
+    properties:
+      female:
+        type: string
+        example: "Lyra Stoneheart"
+      male:
+        type: string
+        example: "Leon Stoneheart"
+    additionalProperties: false
+
+  rarity:
+    type: string
+    enum: [R, SR, SSR, UR]
+    description: "R = common filler, SR = reliable specialist, SSR = premium, UR = rare/prestige"
+
+  combat_role:
+    type: string
+    enum: [recon, sabotage, healer, support, tank, glass_cannon]
+
+  profession:
+    type: string
+    enum: [miner, lumberjack, researcher, construction, farmer, trainer]
+    description: "Primary village assignment profession. Used to determine suitability bonuses."
+
+  region_origin:
+    type: string
+    description: "World region this character is associated with. Affects banner pools and event tags."
+    example: "heartwood_vale"
+
+  element:
+    type: string
+    enum: [fire, water, earth, wind, light, shadow, null]
+    description: "Optional elemental archetype. 'null' means no element."
+    default: "null"
+
+  personality:
+    type: string
+    description: "Short personality descriptor used for relationship flavor and dialogue tags."
+    example: "stoic_protector"
+
+  base_stats:
+    type: object
+    description: "Stats at level 1 / ascension 0. Scaling is applied by the server formula."
+    required: [hp, attack, defense, speed]
+    properties:
+      hp:
+        type: integer
+        minimum: 1
+      attack:
+        type: integer
+        minimum: 1
+      defense:
+        type: integer
+        minimum: 1
+      speed:
+        type: integer
+        minimum: 1
+      crit_rate:
+        type: number
+        minimum: 0.0
+        maximum: 1.0
+        default: 0.05
+      crit_damage:
+        type: number
+        minimum: 1.0
+        default: 1.5
+    additionalProperties: false
+
+  skills:
+    type: array
+    description: "Character skills. First entry is the combat passive; second is the signature active."
+    minItems: 1
+    maxItems: 4
+    items:
+      type: object
+      required: [id, name, description, type]
+      properties:
+        id:
+          type: string
+          pattern: "^[a-z][a-z0-9_]*$"
+        name:
+          type: string
+        description:
+          type: string
+        type:
+          type: string
+          enum: [passive, active, ultimate]
+        max_level:
+          type: integer
+          minimum: 1
+          maximum: 10
+          default: 5
+        upgrade_cost_per_level:
+          type: object
+          description: "Resource costs to advance one skill level. Keys are resource IDs."
+          additionalProperties:
+            type: integer
+            minimum: 0
+
+  suitability_bonuses:
+    type: object
+    description: >
+      Multiplier applied to passive output when this character is assigned to a matching
+      job slot. A character with their primary profession gets 1.5x; secondary gets 1.2x;
+      unmatched gets 1.0x (no bonus). These values override the defaults.
+    properties:
+      primary_profession_multiplier:
+        type: number
+        minimum: 1.0
+        default: 1.5
+      secondary_professions:
+        type: array
+        items:
+          type: string
+          enum: [miner, lumberjack, researcher, construction, farmer, trainer]
+        description: "Additional professions where this character earns the secondary bonus."
+    additionalProperties: false
+
+  bond_hooks:
+    type: array
+    description: "Relationship flavor tags used to unlock bond dialogue and minor stat bonuses."
+    items:
+      type: string
+    example: ["loyalty", "mentor", "rival"]
+
+  lore_summary:
+    type: string
+    description: "One or two sentence background. Minimal story as per spec."