Add complete homelab documentation and configurations

Documentation:
- OpenCode + LiteLLM integration guide
- LiteLLM complete setup with 16 models
- Gitea centralized configuration guide
- Testing procedures and verification
- API keys setup instructions

Configurations:
- OpenCode config pointing to LiteLLM
- Updated LiteLLM config with all models
- Nextcloud docker-compose template

Scripts:
- Gitea setup automation
- OpenCode testing script

Infrastructure:
- Gitea: 192.168.88.200:3000
- LiteLLM: 192.168.88.27:4000
- Nextcloud: 192.168.88.62

litellm/litellm_config_updated.yaml

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+model_list:
+  # =====================================================================
+  # OpenAI - 5 Models (Latest)
+  # =====================================================================
+  - model_name: gpt-4o
+    litellm_params:
+      model: openai/gpt-4o
+      api_key: sk-test-placeholder-openai
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gpt-4o-mini
+    litellm_params:
+      model: openai/gpt-4o-mini
+      api_key: sk-test-placeholder-openai
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gpt-4-turbo
+    litellm_params:
+      model: openai/gpt-4-turbo
+      api_key: sk-test-placeholder-openai
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gpt-4
+    litellm_params:
+      model: openai/gpt-4
+      api_key: sk-test-placeholder-openai
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gpt-3.5-turbo
+    litellm_params:
+      model: openai/gpt-3.5-turbo
+      api_key: sk-test-placeholder-openai
+      timeout: 600
+      max_retries: 2
+
+  # =====================================================================
+  # Anthropic Claude - 6 Models (Latest)
+  # =====================================================================
+  - model_name: claude-3.5-sonnet
+    litellm_params:
+      model: claude/claude-3-5-sonnet-20241022
+      api_key: sk-ant-test-placeholder-claude
+      timeout: 600
+      max_retries: 2
+
+  - model_name: claude-opus-4
+    litellm_params:
+      model: claude/claude-opus-4-1-20250805
+      api_key: sk-ant-test-placeholder-claude
+      timeout: 600
+      max_retries: 2
+
+  - model_name: claude-3-opus
+    litellm_params:
+      model: claude/claude-3-opus-20240229
+      api_key: sk-ant-test-placeholder-claude
+      timeout: 600
+      max_retries: 2
+
+  - model_name: claude-3-sonnet
+    litellm_params:
+      model: claude/claude-3-sonnet-20240229
+      api_key: sk-ant-test-placeholder-claude
+      timeout: 600
+      max_retries: 2
+
+  - model_name: claude-3-haiku
+    litellm_params:
+      model: claude/claude-3-haiku-20240307
+      api_key: sk-ant-test-placeholder-claude
+      timeout: 600
+      max_retries: 2
+
+  - model_name: claude-2.1
+    litellm_params:
+      model: claude/claude-2-1
+      api_key: sk-ant-test-placeholder-claude
+      timeout: 600
+      max_retries: 2
+
+  # =====================================================================
+  # Google Gemini - 5 Models (Latest)
+  # =====================================================================
+  - model_name: gemini-2.0-flash
+    litellm_params:
+      model: google/gemini-2.0-flash
+      api_key: test-placeholder-google-gemini
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gemini-2.0-pro
+    litellm_params:
+      model: google/gemini-2.0-pro
+      api_key: test-placeholder-google-gemini
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gemini-1.5-pro
+    litellm_params:
+      model: google/gemini-1.5-pro
+      api_key: test-placeholder-google-gemini
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gemini-1.5-flash
+    litellm_params:
+      model: google/gemini-1.5-flash
+      api_key: test-placeholder-google-gemini
+      timeout: 600
+      max_retries: 2
+
+  - model_name: gemini-pro
+    litellm_params:
+      model: google/gemini-pro
+      api_key: test-placeholder-google-gemini
+      timeout: 600
+      max_retries: 2
+
+# =====================================================================
+# Global Configuration
+# =====================================================================
+master_key: litellm-local-key-change-in-production
+database_url: ""
+print_verbose: true
+general_settings:
+  disable_ssl_warnings: true
+  request_timeout: 600
+  max_retries: 2
+
+# =====================================================================
+# Logging Configuration
+# =====================================================================
+litellm_settings:
+  log_responses: true
+  request_timeout: 600
+  max_retries: 2
+  verbose: true