chore: initialize Go module and project scaffold

.env.example

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+# llama.cpp server
+LLAMACPP_URL=http://localhost:8080
+MODEL_NAME=
+SYSTEM_PROMPT=You are Diva, a curious and thoughtful AI companion.
+TEMPERATURE=0.85
+TOP_P=0.9
+MAX_TOKENS=2048
+CONTEXT_SIZE=8192
+
+# SQLite
+DB_PATH=./data/divacode.db
+COMPANION_DB_PATH=./data/companion.db
+
+# Matrix (optional — set ENABLED=true to activate)
+MATRIX_ENABLED=false
+MATRIX_HOMESERVER=
+MATRIX_USER=
+MATRIX_TOKEN=
+
+# Scheduler
+SCHEDULER_INTERVAL=15m
+AUTO_DIARY=true
+DIARY_HOUR=23
+
+# Memory
+MEMORY_TOP_K=5
+MEMORY_MIN_SCORE=0.6
+
+# Embedding
+EMBEDDING_MODEL=
+
+# Personality
+TRAIT_CHANGE_MAX_DAILY=0.005
+TRAIT_CHANGE_MAX_MONTHLY=0.05
+
+# Logging
+LOG_LEVEL=INFO
+
+# HTTP API (optional)
+API_ENABLED=false
+API_PORT=8080