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/data/jobs/lumber_camp.yaml

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+# Lumber Camp — Lumberjack job slot
+# The primary manual work target in the PoC.
+# Wood is the designed scarcity bottleneck: it gates construction upgrades
+# and several early character ascension recipes. Players can passively
+# accumulate wood here, or use the manual_work action for burst gains.
+# manual_work_eligible: true makes this the focus of the micro-management demo.
+
+$schema: "xyvera/content-schema/job/v1"
+
+id: lumber_camp
+name: "Lumber Camp"
+description: >
+  Workers harvest timber from the forest edge of Heartwood Vale. Wood is the
+  backbone of early construction and a bottleneck players will want to push past.
+  Assign a lumberjack here for full output, or use the manual work action to
+  chop extra wood yourself.
+
+profession: lumberjack
+output_resource: wood
+base_output_per_hour: 12.0
+
+secondary_output:
+  resource: gold
+  rate_fraction: 0.15  # small gold bonus representing sold scrap timber
+
+max_slots: 3
+
+unlock_condition:
+  building_level: 0  # available from the start
+
+manual_work_eligible: true  # this is the PoC manual micro-management target
+
+passive_cap_hours: 8.0