Add detailed SQLAlchemy models, navigation metadata, enumerations, Pydantic schemas, monitoring, and auditing documentation

- Introduced SQLAlchemy models for user management, project management, financial inputs, and pricing configuration.
- Created navigation metadata tables for sidebar and top-level menus.
- Cataloged enumerations used across ORM models and Pydantic schemas.
- Documented Pydantic schemas for API request/response validation, including authentication, project, scenario, import, and export schemas.
- Added monitoring and auditing tables for performance metrics and import/export logs.
- Updated security documentation to reflect changes in data model references.

architecture/08_concepts/02_data_model/03_enumerations.md

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+# Enumerations
+
+This page catalogs the enumerations shared by Calminer ORM models and Pydantic schemas. The entries mirror the original content from `02_data_model.md` so enum updates can be maintained independently of the broader data model reference.
+
+## MiningOperationType
+
+Supported mining operation categories.
+
+- `OPEN_PIT`: Open pit mining
+- `UNDERGROUND`: Underground mining
+- `IN_SITU_LEACH`: In-situ leaching
+- `PLACER`: Placer mining
+- `QUARRY`: Quarry operations
+- `MOUNTAINTOP_REMOVAL`: Mountaintop removal
+- `OTHER`: Other operations
+
+## ScenarioStatus
+
+Lifecycle states for project scenarios.
+
+- `DRAFT`: Draft status
+- `ACTIVE`: Active status
+- `ARCHIVED`: Archived status
+
+## FinancialCategory
+
+Enumeration of cost and revenue classifications.
+
+- `CAPITAL_EXPENDITURE`: Capital expenditures
+- `OPERATING_EXPENDITURE`: Operating expenditures
+- `REVENUE`: Revenue
+- `CONTINGENCY`: Contingency
+- `OTHER`: Other
+
+## DistributionType
+
+Supported stochastic distribution families for simulations.
+
+- `NORMAL`: Normal distribution
+- `TRIANGULAR`: Triangular distribution
+- `UNIFORM`: Uniform distribution
+- `LOGNORMAL`: Lognormal distribution
+- `CUSTOM`: Custom distribution
+
+## ResourceType
+
+Primary consumables and resources used in mining operations.
+
+- `DIESEL`: Diesel fuel
+- `ELECTRICITY`: Electrical power
+- `WATER`: Process water
+- `EXPLOSIVES`: Blasting agents
+- `REAGENTS`: Processing reagents
+- `LABOR`: Direct labor
+- `EQUIPMENT_HOURS`: Equipment operating hours
+- `TAILINGS_CAPACITY`: Tailings storage
+
+## CostBucket
+
+Granular cost buckets aligned with project accounting.
+
+- `CAPITAL_INITIAL`: Initial capital
+- `CAPITAL_SUSTAINING`: Sustaining capital
+- `OPERATING_FIXED`: Fixed operating costs
+- `OPERATING_VARIABLE`: Variable operating costs
+- `MAINTENANCE`: Maintenance costs
+- `RECLAMATION`: Reclamation costs
+- `ROYALTIES`: Royalties
+- `GENERAL_ADMIN`: General and administrative
+
+## StochasticVariable
+
+Domain variables that typically require probabilistic modelling.
+
+- `ORE_GRADE`: Ore grade variability
+- `RECOVERY_RATE`: Metallurgical recovery
+- `METAL_PRICE`: Commodity price
+- `OPERATING_COST`: Operating cost per tonne
+- `CAPITAL_COST`: Capital cost
+- `DISCOUNT_RATE`: Discount rate
+- `THROUGHPUT`: Plant throughput
+
+Refer back to the [data model overview](../02_data_model.md) when choosing the appropriate enum for new features.